Safe overclock?

Foxconn x38a / Ibuilt
February 17, 2009 at 08:08:22
Specs: XP Home/VistaPrem64b, Xeon 3110 3.0/G.Skil
Is this a safe overclock? Are the voltages ok etc.

E8400 CPU = 3.911 GHz @ 1.34 volts
GSkill DDR2 1066 = 870 MHz @ 2.18 volts
FSB = 1738.5 MHz

Real Temp reports the highest core temp while playing crysis was 60c. Is this temp safe?

Which produces faster performance, higher FSB or higher CPU speed. In other words if I have my multiplier x9 I will get 3.911GHz. If it's x6 I will get 2.60GHz with the same FSB.

What is EPP?

Sorry about so many questions. I'm trying to get to 2000MHz FSB if it's possible. At 4.0GHz I can boot but it's not stable. I thought this might be due to the CPU being maxed. So if I were to reduce the multiplier the CPU would be lower but the FSB will be the same?

My multiplier optins are 6,7,7.5,8,8.5 and 9. If I change the multiplier it will either not boot or will boot and will be 9 no matter what I set it at.

Any thoughts appreciated.

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February 17, 2009 at 09:57:43
When overclocking Intel systems, you should strive to clock the CPU as fast as possible, at the highest FSB possible, while maintaining a CPU frequency:DRAM frequency ratio of 1:1. It appears that's exactly what you've done...CPU frequency at 435MHz (1740MHz FSB), RAM frequency at 435MHz (DDR870).

To get it to run at 500MHz (2000MHz FSB), you'll have to lower the CPU multiplier & will probably have to increase the voltage to the northbridge chipset, possibly the CPU as well.

EPP = Enhanced Performance Profiles. This article explains it pretty well:

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February 17, 2009 at 15:19:36
Thanks jam. So unless we have EPP DIMM Modules, EPP should be disabled?

I'll keep trying to get the multiplier to change. I don't know, I must be missing a step.

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February 17, 2009 at 18:57:16
A word of advice about vcore on 45nm intel chips... Keep it below 1.35v(electro migration will reduce its lifespan). I run 3.99ghz(e8400)with a multiplier of 7.5 and a bus speed of 533. This gives a rated fsb of 2134 and maintains a 1:1 ratio, memory to cpu ( use cpu-z to verify). You may have to see what your motherboard can do as far as fsb is concerned. To try this, lower the multiplier to lowest setting and raise fsb 15-20 mhz at a time and see where your board tops out at. As Jam stated, you may need to raise northbridge and cpu voltage to get further than what you have.Once you have determined how far you can go with the fsb, Lower it back down to the 435 you were originally at. Change the cpu multiplier to 7.5(if you can, may be a setting in bios to unlock multiplier), then slowly increase fsb toward the max that you determined with cpu muliplier at lowest setting. I have had good success leaving NB voltage to auto on my motherboard. I have a Biostar TPower I45. Mileage may and will vary from board to board. If you cannot achieve higher fsb speeds, find a ram divider that gives you the recommended 1:1 ratio. A 1ghz overclock is all you will get stable with air cooling, and without dangerous vcore voltage increase. To check benchmark results along the way I used Super PI mod ver1.5. Run the 1MB and watch the total time. I also used prime 95 but you have to be careful of which type of stress test you use from within that program (use small 8kb fft's). My appologies if this is confusing, I am not as well versed at posing as the regulars here.

Be Good, Robert
core2duo e8400@3.99w/Big Typhoon
biostar tpower i45 w/chipset cooler
2X2GB mushkin ddr2 1066
WDC 74GB Raptor
Enermax 485W PS

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