Tom's Hardware > Forum > Overclocking > CPUs > I7 Overclock issues
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SmAcKtArD   06-23-2009 at 03:14:33 AM

I've got a few queries about my i7 920. I'm not really happy with the temps it's producing at the voltages being used, below is a rough BIOS spec.

These are the OC specs @ 3.66GHz:

Blck: 183
Multiplier: 20
CPU core voltage: 1.30
QPI voltage: 1.30
CPU PLL: 1.88
Mem: 1523MHz (something along those lines, its 1066MHz but OC with 183 Blck)
Uncore: x16
DRAM voltage: 1.66

Load-line: Enabled
CPU amplitude: 800mv
CPU spread spectrum: Disabled
PCI-e spread spectrum: Disabled

I think that's most of the important stuff, if I've missed anything else that might give more clues, let me know.

ATM, I am running Prime95@81,80,81,78. It seems to be stable but I'm not massively happy with the temps tbh, especially with only running at 1.30v. Lowering the core voltage below 1.30v causes a BSOD within 5-10 mins @ 3.66GHz.

Am I missing something here? I have re-applied AS5 twice and the temps are pretty much identical to each other.

I am using an Akasa Nero 967 Heatsink with the provided fan.

I am at my wits end, I have been tweaking for days to try and get a good temp, 3.66GHz is plenty enough but at 81c, it's HOT!! Going above 3.66GHz requires atleast 1.35v on core to POST but temps get ridiculously hot at say 3.8GHz and isn't even fully stable.

Ambient temp for the room is roughly 23c, and I am using a C0/C1 revision chip.

Any help would be greatly appreciated, thanks.

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Grnkjr0   06-23-2009 at 06:14:55 AM
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I think those temperatures are normal when under load running Prime95. The reason being you have a C0/C1 chip and that cooler is not among the best on the market. It also depends on what case you have and have good your airflow is within it and whether your graphics card is creating a lot of heat and the room temperature of course. Read some reviews on coolers - cheapest choice is a Scythe Mugen 2. that one is among the best and very cheap - you need a big case though - read up on that.

Reply to Grnkjr0
nonxcarbonx   06-23-2009 at 08:22:51 AM
- 0 +

I've noticed prime95 gets my cpu 2-3 degrees hotter than boinc @ 100% cpu.

------------------------------ Core i7 920 @3.8ghz|Foxconn Renaissance Motherboard|2 GTX 260s in SLI|750 Watt PSU|6 GB RAM|80GB Intel-X18 SSD|Windows 7
 Reply to nonxcarbonx
PsychoSaysDie   06-23-2009 at 10:04:51 AM
- 0 +

What is it with you guys changing everything in the bios. My 920's did 4+Ghz with a simple vcore change and everything else on auto.

Reset everything in the bios. Change the Vcore to 1.4v, leave everything else on auto, disable turbo, Bclk to 200. Enjoy

------------------------------ E8600 @ 5Ghz 1.475v
8GB DDR3 2000
Intel X25-M
XFX 5770 In X-Fire
 Reply to PsychoSaysDie
ehanger   06-23-2009 at 02:23:27 PM
- 0 +

If his cpu is hitting 80*C+ @ 1.3V and 3.66GHz HOW would upping the voltage to 1.4V and freq. to 4.0GHz make it any better???

Message quoted 1 times
------------------------------ Intel core i7 920 @ 3.5GHz
ASUS P6T
Corsair 3GB DDR3-1333
(2x) EVGA GTX 275 SLI
Reply to ehanger
PsychoSaysDie   06-23-2009 at 03:08:18 PM
- 0 +

ehanger wrote :

If his cpu is hitting 80*C+ @ 1.3V and 3.66GHz HOW would upping the voltage to 1.4V and freq. to 4.0GHz make it any better???



He's hitting 80C with prime. Not under normal conditions

------------------------------ E8600 @ 5Ghz 1.475v
8GB DDR3 2000
Intel X25-M
XFX 5770 In X-Fire
 Reply to PsychoSaysDie
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