in demo mode, after 6 minutes of gameplay, minecraft crashes with a Unexpected Error message.

crash reports:
---- Minecraft Crash Report ----
// Shall we play a game?

Time: 12/02/15 01:19 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bbz.au(SourceFile:1435)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)
at bbz.s(SourceFile:1596)
at bbz.as(SourceFile:942)
at bbz.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:122)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bbz.au(SourceFile:1435)
at bbz.ax(SourceFile:1934)
at bbz.aw(SourceFile:1752)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmg['Player'/130, l='MpServer', x=-90.50, y=85.00, z=-191.45]]
Chunk stats: MultiplayerChunkCache: 624, 624
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-20,64,-60), Chunk: (at 12,4,4 in -2,-4; contains blocks -32,0,-64 to -17,255,-49), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 11085 game time, 11085 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 90 total; [wa['Sheep'/0, l='MpServer', x=-119.47, y=70.00, z=-182.22], wa['Sheep'/1, l='MpServer', x=-105.61, y=74.27, z=-180.50], wa['Sheep'/2, l='MpServer', x=-129.16, y=70.00, z=-192.97], wa['Sheep'/3, l='MpServer', x=-134.09, y=68.00, z=-186.84], wa['Sheep'/5, l='MpServer', x=-120.44, y=75.00, z=-239.25], wa['Sheep'/7, l='MpServer', x=-104.56, y=69.45, z=-235.44], wa['Sheep'/8, l='MpServer', x=-74.22, y=72.00, z=-220.50], wa['Sheep'/9, l='MpServer', x=-85.16, y=71.00, z=-229.66], wa['Sheep'/10, l='MpServer', x=-90.41, y=72.00, z=-231.81], wa['Sheep'/11, l='MpServer', x=-91.63, y=72.00, z=-234.81], wa['Sheep'/12, l='MpServer', x=-66.50, y=76.00, z=-137.50], wa['Sheep'/13, l='MpServer', x=-65.50, y=76.00, z=-136.50], wa['Sheep'/14, l='MpServer', x=-64.50, y=77.00, z=-138.50], vu['Cow'/18, l='MpServer', x=-61.09, y=74.00, z=-114.09], wa['Sheep'/19, l='MpServer', x=-35.50, y=67.00, z=-232.50], wa['Sheep'/20, l='MpServer', x=-34.50, y=66.00, z=-233.50], wa['Sheep'/21, l='MpServer', x=-28.09, y=65.00, z=-237.19], wa['Sheep'/22, l='MpServer', x=-33.50, y=66.00, z=-233.50], wa['Sheep'/23, l='MpServer', x=-28.50, y=72.00, z=-197.50], wa['Sheep'/24, l='MpServer', x=-31.50, y=74.00, z=-198.50], wa['Sheep'/25, l='MpServer', x=-32.50, y=73.00, z=-196.50], wa['Sheep'/26, l='MpServer', x=-36.50, y=75.00, z=-199.50], wa['Sheep'/27, l='MpServer', x=-31.72, y=69.00, z=-147.56], wa['Sheep'/28, l='MpServer', x=-30.50, y=66.00, z=-153.50], wa['Sheep'/29, l='MpServer', x=-26.50, y=66.00, z=-153.97], wa['Sheep'/30, l='MpServer', x=-32.09, y=68.00, z=-161.91], wa['Sheep'/4152, l='MpServer', x=-64.50, y=68.00, z=-255.50], wa['Sheep'/4153, l='MpServer', x=-66.53, y=69.00, z=-247.19], zf['Zombie'/14444, l='MpServer', x=-53.50, y=23.00, z=-124.50], bmg['Player'/130, l='MpServer', x=-90.50, y=85.00, z=-191.45], yn['Creeper'/14490, l='MpServer', x=-69.50, y=28.00, z=-143.50], yn['Creeper'/16548, l='MpServer', x=-31.50, y=48.00, z=-252.50], yn['Creeper'/16598, l='MpServer', x=-81.50, y=55.00, z=-124.50], zf['Zombie'/14582, l='MpServer', x=-34.50, y=33.00, z=-237.50], zb['Skeleton'/16647, l='MpServer', x=-30.50, y=34.00, z=-243.50], zb['Skeleton'/16648, l='MpServer', x=-33.44, y=33.00, z=-239.22], zb['Skeleton'/16658, l='MpServer', x=-104.50, y=45.00, z=-179.50], zb['Skeleton'/16659, l='MpServer', x=-104.50, y=45.00, z=-178.50], zf['Zombie'/16660, l='MpServer', x=-104.50, y=45.00, z=-179.50], zd['Spider'/14707, l='MpServer', x=-62.50, y=13.00, z=-145.50], zf['Zombie'/16775, l='MpServer', x=-39.50, y=40.00, z=-136.50], zf['Zombie'/16776, l='MpServer', x=-32.53, y=45.00, z=-128.85], zb['Skeleton'/16777, l='MpServer', x=-41.50, y=40.00, z=-136.50], vq['Bat'/16802, l='MpServer', x=-108.78, y=24.01, z=-135.75], vq['Bat'/17032, l='MpServer', x=-81.54, y=42.36, z=-121.86], vq['Bat'/17033, l='MpServer', x=-71.61, y=46.06, z=-118.71], yn['Creeper'/15033, l='MpServer', x=-43.66, y=30.00, z=-149.88], zb['Skeleton'/17097, l='MpServer', x=-78.50, y=52.00, z=-134.50], zb['Skeleton'/17098, l='MpServer', x=-78.50, y=52.00, z=-131.50], zf['Zombie'/17115, l='MpServer', x=-120.50, y=26.00, z=-192.50], yn['Creeper'/17129, l='MpServer', x=-87.50, y=38.00, z=-139.50], yn['Creeper'/17130, l='MpServer', x=-89.50, y=38.00, z=-139.50], yn['Creeper'/15118, l='MpServer', x=-80.50, y=50.00, z=-135.50], wa['Sheep'/4926, l='MpServer', x=-108.59, y=72.00, z=-264.25], wa['Sheep'/4927, l='MpServer', x=-102.94, y=71.00, z=-270.97], wa['Sheep'/4928, l='MpServer', x=-69.75, y=68.00, z=-252.00], wa['Sheep'/4929, l='MpServer', x=-64.19, y=67.00, z=-259.53], zb['Skeleton'/15198, l='MpServer', x=-49.50, y=25.00, z=-141.50], yn['Creeper'/11112, l='MpServer', x=-122.50, y=27.00, z=-187.50], vq['Bat'/15271, l='MpServer', x=-47.25, y=40.10, z=-130.75], wa['Sheep'/5055, l='MpServer', x=-110.72, y=73.00, z=-269.53], vq['Bat'/15301, l='MpServer', x=-97.49, y=13.91, z=-193.54], zf['Zombie'/15385, l='MpServer', x=-54.50, y=28.00, z=-262.50], zf['Zombie'/15386, l='MpServer', x=-53.50, y=28.00, z=-263.50], zf['Zombie'/15432, l='MpServer', x=-68.50, y=27.00, z=-138.50], zb['Skeleton'/15517, l='MpServer', x=-109.50, y=27.00, z=-208.50], yn['Creeper'/15519, l='MpServer', x=-110.50, y=27.00, z=-209.50], yn['Creeper'/15520, l='MpServer', x=-108.50, y=27.00, z=-205.50], zb['Skeleton'/15612, l='MpServer', x=-102.50, y=35.00, z=-153.50], vq['Bat'/15620, l='MpServer', x=-23.95, y=26.07, z=-121.52], zb['Skeleton'/15679, l='MpServer', x=-42.50, y=24.00, z=-138.50], zb['Skeleton'/15691, l='MpServer', x=-101.50, y=28.00, z=-153.50], zf['Zombie'/15732, l='MpServer', x=-112.50, y=46.00, z=-126.50], zb['Skeleton'/15900, l='MpServer', x=-55.88, y=16.00, z=-140.53], zb['Skeleton'/15955, l='MpServer', x=-59.78, y=20.00, z=-143.34], zb['Skeleton'/15956, l='MpServer', x=-60.09, y=22.00, z=-145.53], zf['Zombie'/13947, l='MpServer', x=-52.53, y=54.00, z=-112.09], zb['Skeleton'/16040, l='MpServer', x=-78.41, y=29.00, z=-151.00], vq['Bat'/16052, l='MpServer', x=-65.03, y=29.97, z=-145.95], zf['Zombie'/16109, l='MpServer', x=-32.50, y=23.00, z=-126.50], zd['Spider'/16110, l='MpServer', x=-39.50, y=23.00, z=-132.50], zb['Skeleton'/16114, l='MpServer', x=-13.50, y=20.00, z=-229.50], zb['Skeleton'/16127, l='MpServer', x=-101.50, y=25.00, z=-123.50], yn['Creeper'/16139, l='MpServer', x=-100.50, y=25.00, z=-216.50], yn['Creeper'/16140, l='MpServer', x=-99.50, y=25.00, z=-213.50], yn['Creeper'/16141, l='MpServer', x=-97.50, y=25.00, z=-212.50], vq['Bat'/16208, l='MpServer', x=-27.67, y=36.00, z=-242.21], yn['Creeper'/14255, l='MpServer', x=-86.66, y=30.00, z=-148.50], yn['Creeper'/14286, l='MpServer', x=-108.50, y=23.00, z=-140.50], zd['Spider'/16371, l='MpServer', x=-108.50, y=25.00, z=-164.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkh.a(SourceFile:364)
at bbz.b(SourceFile:2496)
at bbz.a(SourceFile:400)
at net.minecraft.client.main.Main.main(SourceFile:122)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 142993976 bytes (136 MB) / 394104832 bytes (375 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 15w49a
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 9.17.10.4229, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 2x Intel(R) Celeron(R) CPU B830 @ 1.80GHz

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 12/02/15 01:28 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bkg.a(SourceFile:142)
at bkg.b(SourceFile:247)
at bbz.b(SourceFile:1345)
at bbz.ax(SourceFile:1945)
at bbz.aw(SourceFile:1752)
at bbz.s(SourceFile:1596)
at bbz.as(SourceFile:942)
at bbz.a(SourceFile:386)
at net.minecraft.client.main.Main.main(SourceFile:122)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at rx.a_(SourceFile:409)
at zo.a(SourceFile:1818)
at rx.a(SourceFile:1198)
at bkg.a(SourceFile:142)
at bkg.b(SourceFile:247)
at bbz.b(SourceFile:1345)
at bbz.ax(SourceFile:1945)
at bbz.aw(SourceFile:1752)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmg['Player'/1819, l='MpServer', x=-120.62, y=65.00, z=-172.36]]
Chunk stats: MultiplayerChunkCache: 617, 617
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-20,64,-60), Chunk: (at 12,4,4 in -2,-4; contains blocks -32,0,-64 to -17,255,-49), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 7733 game time, 7733 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 91 total; [vq['Bat'/14342, l='MpServer', x=-183.75, y=27.10, z=-251.25], xz['item.tile.sapling.oak'/12321, l='MpServer', x=-88.13, y=95.00, z=-185.34], zb['Skeleton'/14388, l='MpServer', x=-113.50, y=30.00, z=-177.50], yn['Creeper'/13368, l='MpServer', x=-60.06, y=67.00, z=-100.16], yn['Creeper'/13369, l='MpServer', x=-59.66, y=72.00, z=-105.13], zf['Zombie'/14431, l='MpServer', x=-112.50, y=19.00, z=-197.50], xz['item.item.apple'/12446, l='MpServer', x=-101.34, y=81.00, z=-185.66], yo['Enderman'/13499, l='MpServer', x=-143.50, y=18.00, z=-226.50], zf['Zombie'/11468, l='MpServer', x=-67.50, y=15.00, z=-157.50], zb['Skeleton'/11516, l='MpServer', x=-113.50, y=29.00, z=-172.50], vq['Bat'/14598, l='MpServer', x=-172.25, y=22.02, z=-237.41], vq['Bat'/14599, l='MpServer', x=-171.71, y=27.00, z=-238.27], xz['item.tile.sapling.birch'/12575, l='MpServer', x=-96.50, y=87.00, z=-192.13], zb['Skeleton'/13615, l='MpServer', x=-53.50, y=24.00, z=-136.50], yn['Creeper'/13616, l='MpServer', x=-52.50, y=24.00, z=-133.50], zf['Zombie'/14657, l='MpServer', x=-89.50, y=14.00, z=-153.50], zf['Zombie'/14658, l='MpServer', x=-93.50, y=14.00, z=-154.50], wc['Squid'/11596, l='MpServer', x=-184.63, y=58.41, z=-139.84], vq['Bat'/14668, l='MpServer', x=-78.60, y=54.08, z=-123.53], vq['Bat'/14678, l='MpServer', x=-80.54, y=29.08, z=-157.20], wc['Squid'/11614, l='MpServer', x=-108.34, y=62.00, z=-120.41], yn['Creeper'/14701, l='MpServer', x=-104.50, y=33.00, z=-139.50], yn['Creeper'/12657, l='MpServer', x=-100.50, y=14.00, z=-192.50], zf['Zombie'/14730, l='MpServer', x=-81.50, y=50.00, z=-142.50], xz['item.item.seeds'/9632, l='MpServer', x=-59.94, y=66.00, z=-230.38], vq['Bat'/13732, l='MpServer', x=-162.71, y=16.05, z=-252.28], yo['Enderman'/12715, l='MpServer', x=-199.50, y=27.00, z=-217.50], vq['Bat'/13753, l='MpServer', x=-59.25, y=57.10, z=-101.25], vq['Bat'/13755, l='MpServer', x=-57.52, y=57.13, z=-96.94], vq['Bat'/13756, l='MpServer', x=-70.31, y=56.66, z=-99.53], yn['Creeper'/12737, l='MpServer', x=-107.72, y=33.00, z=-187.47], zf['Zombie'/14790, l='MpServer', x=-95.50, y=29.00, z=-147.50], zf['Zombie'/14801, l='MpServer', x=-45.50, y=12.00, z=-124.50], zf['Zombie'/14802, l='MpServer', x=-47.50, y=12.00, z=-124.50], zb['Skeleton'/14818, l='MpServer', x=-58.50, y=27.00, z=-174.50], zb['Skeleton'/14819, l='MpServer', x=-58.50, y=27.00, z=-172.50], yn['Creeper'/12774, l='MpServer', x=-176.50, y=14.00, z=-124.50], yn['Creeper'/12775, l='MpServer', x=-178.50, y=14.00, z=-122.50], zf['Zombie'/14828, l='MpServer', x=-102.50, y=27.00, z=-157.50], zf['Zombie'/14829, l='MpServer', x=-103.50, y=27.00, z=-159.50], zd['Spider'/13851, l='MpServer', x=-181.50, y=29.00, z=-237.50], yn['Creeper'/13852, l='MpServer', x=-179.50, y=29.00, z=-229.50], vq['Bat'/12859, l='MpServer', x=-157.73, y=23.94, z=-106.21], yn['Creeper'/13946, l='MpServer', x=-60.50, y=55.00, z=-95.50], yn['Creeper'/13947, l='MpServer', x=-67.50, y=55.00, z=-94.50], zb['Skeleton'/14013, l='MpServer', x=-175.13, y=16.00, z=-243.53], zb['Skeleton'/14014, l='MpServer', x=-171.53, y=16.00, z=-243.88], zf['Zombie'/14029, l='MpServer', x=-67.50, y=27.00, z=-140.50], zb['Skeleton'/14030, l='MpServer', x=-68.50, y=27.00, z=-150.50], zf['Zombie'/13031, l='MpServer', x=-103.50, y=27.00, z=-168.50], zf['Zombie'/13032, l='MpServer', x=-95.94, y=28.00, z=-173.47], yn['Creeper'/14058, l='MpServer', x=-101.50, y=27.00, z=-169.50], yn['Creeper'/14059, l='MpServer', x=-103.50, y=27.00, z=-171.50], zb['Skeleton'/14060, l='MpServer', x=-98.50, y=27.00, z=-172.50], yn['Creeper'/14061, l='MpServer', x=-101.50, y=27.00, z=-172.50], wa['Sheep'/1777, l='MpServer', x=-133.75, y=71.00, z=-204.81], wa['Sheep'/4850, l='MpServer', x=-175.50, y=65.00, z=-249.50], wa['Sheep'/4851, l='MpServer', x=-177.50, y=44.00, z=-248.50], wa['Sheep'/1780, l='MpServer', x=-117.50, y=72.00, z=-238.50], wa['Sheep'/4852, l='MpServer', x=-174.50, y=65.00, z=-248.50], wa['Sheep'/1781, l='MpServer', x=-117.50, y=72.00, z=-237.50], wa['Sheep'/4853, l='MpServer', x=-177.50, y=44.00, z=-248.50], wa['Sheep'/1782, l='MpServer', x=-126.72, y=78.00, z=-241.47], wa['Sheep'/1783, l='MpServer', x=-117.50, y=73.00, z=-241.50], wa['Sheep'/1784, l='MpServer', x=-88.84, y=73.00, z=-217.63], wa['Sheep'/1785, l='MpServer', x=-83.19, y=71.00, z=-222.28], wa['Sheep'/4857, l='MpServer', x=-67.75, y=69.00, z=-247.19], wa['Sheep'/1786, l='MpServer', x=-97.91, y=75.00, z=-207.34], wa['Sheep'/1787, l='MpServer', x=-81.25, y=72.00, z=-218.69], wa['Sheep'/1788, l='MpServer', x=-60.16, y=75.00, z=-131.25], wa['Sheep'/1789, l='MpServer', x=-65.50, y=76.00, z=-136.50], wa['Sheep'/1790, l='MpServer', x=-64.50, y=77.00, z=-138.50], vu['Cow'/1791, l='MpServer', x=-48.47, y=69.00, z=-121.78], vu['Cow'/1792, l='MpServer', x=-72.50, y=74.00, z=-120.31], vu['Cow'/1793, l='MpServer', x=-70.47, y=75.00, z=-115.75], vu['Cow'/1794, l='MpServer', x=-65.50, y=75.00, z=-121.75], wa['Sheep'/1798, l='MpServer', x=-41.84, y=67.00, z=-232.44], vq['Bat'/13069, l='MpServer', x=-75.25, y=25.40, z=-178.29], bmg['Player'/1819, l='MpServer', x=-120.62, y=65.00, z=-172.36], xz['item.item.apple'/14126, l='MpServer', x=-85.47, y=94.00, z=-192.47], yn['Creeper'/13128, l='MpServer', x=-112.50, y=23.00, z=-140.50], xz['item.tile.sapling.oak'/14190, l='MpServer', x=-83.69, y=94.00, z=-192.75], yn['Creeper'/14206, l='MpServer', x=-52.50, y=45.00, z=-110.50], zb['Skeleton'/14209, l='MpServer', x=-104.94, y=54.00, z=-110.38], zb['Skeleton'/14210, l='MpServer', x=-104.16, y=54.00, z=-111.31], zb['Skeleton'/14236, l='MpServer', x=-71.50, y=47.00, z=-133.50], xz['item.tile.sapling.oak'/11189, l='MpServer', x=-98.09, y=85.00, z=-182.81], zb['Skeleton'/13254, l='MpServer', x=-92.50, y=33.00, z=-136.50], zd['Spider'/13256, l='MpServer', x=-108.50, y=23.00, z=-141.50], zb['Skeleton'/13285, l='MpServer', x=-82.50, y=26.00, z=-171.50], xz['item.tile.sapling.oak'/13301, l='MpServer', x=-87.75, y=96.00, z=-188.13]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkh.a(SourceFile:364)
at bbz.b(SourceFile:2496)
at bbz.a(SourceFile:400)
at net.minecraft.client.main.Main.main(SourceFile:122)

– System Details –
Details:
Minecraft Version: 15w49a
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 128183640 bytes (122 MB) / 423636992 bytes (404 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
Launched Version: 15w49a
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 9.17.10.4229, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 2x Intel(R) Celeron(R) CPU B830 @ 1.80GHz