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Old 30-08-2009, 02:10 AM   #49
Booj
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Nice work mate

Have you tried with lower vtt? I found on air and cascade that my chip didn't like high vtt. Even at max clocks on cascade I never went over 1.48v on Gigabyte EX58 Extreme. I am running dual channel though, perhaps the vtt requirement is less.

Might be worth a try in dual channel? Pi times will take a hit, but it might help you eek out those last few mhz for 3d.
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Old 30-08-2009, 11:17 AM   #50
DJG
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It looks like BIOS 0007 has an earlier date than 0001, so I won't try it since I already tried 0001.
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Old 30-08-2009, 11:29 AM   #51
eva2000
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By Booj View Post
Nice work mate

Have you tried with lower vtt? I found on air and cascade that my chip didn't like high vtt. Even at max clocks on cascade I never went over 1.48v on Gigabyte EX58 Extreme. I am running dual channel though, perhaps the vtt requirement is less.

Might be worth a try in dual channel? Pi times will take a hit, but it might help you eek out those last few mhz for 3d.
yeah dual channel may need less CPU VTT (QPI/DRAM) volts than triple channel. With my setup the high mem clocks of GT require high CPU VTT volts too otherwise don't get stable memory clocks. But will try again as well as with looser 8-9-8-22 timings to confirm if it's memory or cpu heat/clocks holding it back

By DJG View Post
It looks like BIOS 0007 has an earlier date than 0001, so I won't try it since I already tried 0001.
yup 0007 is older than 0001 bios

Took a side by side screenshot of my 12x mem multi DDR3-2184Mhz 7-8-7-20 1T 32M run versus my 10x mem multi higher cpu clocked DDR3-2118Mhz 7-8-7-20 1T 32M run to see what cputweaker reported for my subtimings. See if any subtiming settings are a factor.



DDR3-2184Mhz (12x mem) vs DDR3-2118Mhz (10x mem)
  • QPI/DRAM volts = 1.55v vs 1.6375v due to lower bclk needed on 12x mem config
  • tRFC = 110 vs 88 could be a factor ?
  • tRRD = 7 vs 7 both same
  • tREFI = 955 vs 849
  • tFAW = 37 vs 33
  • tRTL A channel = 56 vs 57
  • tWTP = 27 vs 26
  • tRTP = 7 vs 6
  • Write to Read (same rank) = 20 vs 19

Going to play with subtimings and see

Update: Dropped cpu multiplier to 19x and using 10x memory multiplier, will try to reproduce similar looser subtimings as used in my DDR3-2184Mhz 7-8-7-20 1T run with 12x memory multiplier. I managed to get as far as Super Pi 32M stable @DDR3-2188Mhz 7-8-7-20 1T at 1.84v vdimm

Manually set following subtiming values in bios:
  • tRFC = 110
  • tFAW = 37
  • Back to Back CAS# Delay = 4 (tightened to try and offset loosened tRFC value)
  • Write to Read (same rank) = 20

Super Pi 32M passed at:
DDR3-2158Mhz 7-8-7-20 1T at 1.72v



DDR3-2167Mhz 7-8-7-20 1T at 1.78v



DDR3-2177Mhz 7-8-7-20 1T at 1.80v



DDR3-2188Mhz 7-8-7-20 1T at 1.84v


Last edited by eva2000; 30-08-2009 at 10:50 PM.
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Old 31-08-2009, 03:18 AM   #52
eva2000
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Xeon W3540 HT Disabled
@4702Mhz - 4759Mhz at 1.568v


Was worth the effort in figuring out and applying 12x memory multiplier's subtimings for Corsair Dominator GT with 10x memory multiplier configuration. With manually set subtimings applied to 10x memory multiplier config, was able to get memory memtest86+ test #5 10x loop stable which was enough for me to pass Super Pi 32M @4702Mhz - 22x 214bclk with DDR3-2136Mhz 7-8-7-20 1T at 1.74v. That's a nice improvement over max 32M Pi @4660Mhz with DDR3-2118Mhz 7-8-7-20 1T at 1.84v

Super Pi 1M @4759Mhz




Super Pi 1M & 32M @4702Mhz




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Old 06-09-2009, 03:06 AM   #53
eva2000
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Swapped out single 8800GT for 2x HD4870x2 CrossfireX. I flashed back my HD4870x2 cards from Asus HD4870x2 TOP bios to their original ATI reference HD4870x2 bioses (plan to sell these cards soon). Full 6x2GB = 12GB DDR3 configuration with Windows 7 Ultimate 64bit and Catalyst 9.8 Hotfix drivers.

System:
  • Intel Xeon W3540 3845B010
  • EK Supreme LT 1366 / FESER 480 / MCP655
  • Asus P6T6 WS Revolution
  • 6GB Corsair Dominator GT 2000 7-8-7-20
  • OCZ Platinum DDR3-1333Mhz 7-7-7-24 (OCZ3P1333LVA6GK 'Animal Series')
  • 2x HD4870x2 CrossfireX (HIS + Gigabyte) + CAT 9.8 Hotfix
  • 750GB Samsung SATA
  • Pioneer DVR-217 DVD-RW
  • Corsair HX1000 PSU
  • Dual Boot - WinXP Pro SP3 (nLite fully updated) with Vista Theme & Win7 Ultimate 64bit RTM

W3540 @4550Mhz at 1.472v





W3540 @4400Mhz at 1.384v




W3540 @4000Mhz at 1.184v








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Old 07-09-2009, 04:02 AM   #54
CryptiK
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Pretty impressive numbers there considering you are on air, load temps must be getting up there. That's a great W3540 you have. Just going to stick with the 4890's now or you considering going green to replace the x2's?
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Old 07-09-2009, 04:06 AM   #55
eva2000
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Thanks Tim, I'm on water cooling not air so helps but stil high 80s C is not uncommon under load hehe. GPUs waiting to see what 5870 series from AMD/ATI bring but GTX 295 are tempting but still costly hehe

My new personal best 3dmark06 score ever = 31,812

3dmark06 = 31,812
http://service.futuremark.com/compare?3dm06=11910938



System:
  • Intel Xeon W3540 3845B010
  • EK Supreme LT 1366 / FESER 480 / MCP655
  • Asus P6T6 WS Revolution
  • 6GB Corsair Dominator GT 2000 7-8-7-20
  • OCZ Platinum DDR3-1333Mhz 7-7-7-24 (OCZ3P1333LVA6GK 'Animal Series')
  • 2x HD4870x2 CrossfireX (HIS + Gigabyte) + CAT 9.8 Hotfix
  • 750GB Samsung SATA
  • Pioneer DVR-217 DVD-RW
  • Corsair HX1000 PSU
  • Dual Boot - WinXP Pro SP3 (nLite fully updated) with Vista Theme & Win7 Ultimate 64bit RTM
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Old 10-09-2009, 12:45 AM   #56
eva2000
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Pushing it further with Corsair Dominator GT with 6-7-6-18 timings Pretty tricky getting higher due to fluctuating 3dmark06 cpu scores between runs heh



Finally broke 32k on water cooled cpu and stock air cooled HD4870x2 GPUs!



New personal best for Aquamark3 as well HD4870x2 CF @865/935 = 337,153 !



System:
  • Intel Xeon W3540 3845B010
  • EK Supreme LT 1366 / FESER 480 / MCP655
  • Asus P6T6 WS Revolution
  • 6GB Corsair Dominator GT 2000 7-8-7-20
  • 2x HD4870x2 CrossfireX (HIS + Gigabyte) + CAT 9.8 Hotfix
  • 750GB Samsung SATA
  • Pioneer DVR-217 DVD-RW
  • Corsair HX1000 PSU
  • Dual Boot - WinXP Pro SP3 (nLite fully updated) with Vista Theme & Win7 Ultimate 64bit RTM

Last edited by eva2000; 10-09-2009 at 02:30 AM.
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