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Old 04-14-09   #1 (permalink)
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Question Prime95 & E8400 questions -- solved

Hey all

1) When stress testing with Prime95, which version of the torture tests should I do? Small FFTs, In-place Large FFTs, Blend, or some random custom one?

2) When doing the tests, my second core is faster than the other. Like right now, its two tests ahead of the first core. No errors, no overheating, just a speed difference. Any idea what's making this happen?

3) Generally, how many volts should an e8400 need to be stable at 4GHz?

Thanks a ton!

System: The Communist
CPU
E8400
Motherboard
ASUS P5Q Pro
Memory
2x2GB Mushkin DDR2
Graphics Card
BFG 280
Hard Drive
RAID0 2x WD 500GB
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Onboard
Power Supply
Corsair 650 Watt
Case
Silverstone RV02
CPU cooling
Xigmatek s1283v Dark Knight
GPU cooling
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Windows 7 Ultimate x64
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Acer 21" @ 1680x1050

Last edited by IceColdFreezie : 04-14-09 at 11:19 PM
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Old 04-14-09   #2 (permalink)
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Howdy,

I'll answer your questions in the order in which they were presented.

1. First do small FFTs. That will show that your CPU overclock is stable, but won't test your northbridge or memory. After you're sure your overclock is stable for one full pass on small FFTs, then move on to blend to test overall stability.

2. That's fine. It happens with all of mine, too. The best explanation I can think of is that one core is slightly loaded by keeping the system running, and that leads to the slowdown.

3. I use 1.30625v for my E8400 at 4.050GHz. It is 17-hour Prime95 stable.

Let me know if there is anything else I can do to help.
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System: Velocity Micro Desktop
CPU
E8400 @ 4Ghz (for now)
Motherboard
EVGA 680i SLI
Memory
8 GB Corsair Dominator DDR2
Graphics Card
EVGA GTX 260 Core 216 SE
Hard Drive
Western Digital Caviar 320GB | 2 x 5400 RPM 120 GB
Sound Card
X-Fi Xtreme Audio
Power Supply
Velocity Micro 750w
Case
Lian-Li Velocity Micro Custom
CPU cooling
Tuniq Tower 120 w/ LED
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Custom ~50C MAX
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Vista 64 bit
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Old 04-14-09   #3 (permalink)
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Thanks for the great answers.
You officially rock my socks.

System: The Communist
CPU
E8400
Motherboard
ASUS P5Q Pro
Memory
2x2GB Mushkin DDR2
Graphics Card
BFG 280
Hard Drive
RAID0 2x WD 500GB
Sound Card
Onboard
Power Supply
Corsair 650 Watt
Case
Silverstone RV02
CPU cooling
Xigmatek s1283v Dark Knight
GPU cooling
Stock
OS
Windows 7 Ultimate x64
Monitor
Acer 21" @ 1680x1050
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