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Can't keep my i7 975 stable @ 4GHz on air - Page 2

post #11 of 19
11/11/12 at 8:28pm
Quote:
Originally Posted by Raptorpowa View Post

your'e going to be hot with 1.3..he's on water.....

1.3v is nothing. I ran my W3520 @ 4.8GHz with 1.35v and stayed well under 80c.
The NH-D14 is very impressive. biggrin.gif

@ OP-
I wouldn't overclock the system very far with that PSU. It's a quality unit, but you're really pushing it if you stress the GPU and CPU.
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post #12 of 19
11/11/12 at 8:33pm
Thread Starter 
Quote:
Originally Posted by Jaguarbamf View Post

1.3v is nothing. I ran my W3520 @ 4.8GHz with 1.35v and stayed well under 80c.
The NH-D14 is very impressive. biggrin.gif
@ OP-
I wouldn't overclock the system very far with that PSU. It's a quality unit, but you're really pushing it if you stress the GPU and CPU.

I was thinking of the same thing. I think the PSU might be triggering unexpected reboots.
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post #13 of 19
11/11/12 at 8:49pm
Quote:
Originally Posted by Raptorpowa View Post

your'e going to be hot with 1.3..he's on water.....

Im using an H60, his NHD14 is going to cool better than my setup.

wait a minute though- the 975 should have an unlocked multiplier. you shouldnt have to resort to blowing the FSB through the roof like those of us with locked multis. what FSB/multi combos have you been working with?
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post #14 of 19
11/11/12 at 8:59pm
Thread Starter 
Quote:
Originally Posted by RX7-2nr View Post

Im using an H60, his NHD14 is going to cool better than my setup.
wait a minute though- the 975 should have an unlocked multiplier. you shouldnt have to resort to blowing the FSB through the roof like those of us with locked multis. what FSB/multi combos have you been working with?

Not really quite familiar with the terminologies yet so sorry in advance if I didn't provide with enough details!

Base Clock: 133Mhz (untouched)
CPU multiplier: 30x (4.0GHz)
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post #15 of 19
11/11/12 at 9:15pm
Since you are doing a straight multiplier overclock it should be a little simpler, but I really have no advice on that because all of my experience on these particular CPUs has been with the i7 920 and 930.

I did a quick search and couldnt come up with a lot of guides on overclocking these CPUs. If I were doing it personally, I would probably increase the bclk some as well as the multiplier. 160x25 is 4ghz, something like that probably. If straight multiplier increases dont work for you, try increasing the bclk and keeping your multi a little lower.
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post #16 of 19
11/11/12 at 9:40pm
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Quote:
Originally Posted by RX7-2nr View Post

Since you are doing a straight multiplier overclock it should be a little simpler, but I really have no advice on that because all of my experience on these particular CPUs has been with the i7 920 and 930.
I did a quick search and couldnt come up with a lot of guides on overclocking these CPUs. If I were doing it personally, I would probably increase the bclk some as well as the multiplier. 160x25 is 4ghz, something like that probably. If straight multiplier increases dont work for you, try increasing the bclk and keeping your multi a little lower.

Thanks I'll give that a try as well. When I bump up my base clock to 160MHz, what should I set my QPI VTT to (or should I just set it to Auto?)
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post #17 of 19
11/11/12 at 10:20pm
1.3 should be enough without being unnecessarily high. if you get it stable try lowering it if you want. also remember to watch your memory speeds as you change your bclk. you'll have to jump to a lower memory multiplier to stay at 1600 if you increase bclk from 133 to 160.

read over some i7 920 overclocking articles, there are tons of them. itll give you a better understanding of bclk overclocking. overclocking with just your multiplier would be ideal, but if it's not working this is just something else to try.

what other voltages and settings did you tweak when you were trying 133x30?
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post #18 of 19
11/12/12 at 8:05am
Thread Starter 
Quote:
Originally Posted by RX7-2nr View Post

1.3 should be enough without being unnecessarily high. if you get it stable try lowering it if you want. also remember to watch your memory speeds as you change your bclk. you'll have to jump to a lower memory multiplier to stay at 1600 if you increase bclk from 133 to 160.
read over some i7 920 overclocking articles, there are tons of them. itll give you a better understanding of bclk overclocking. overclocking with just your multiplier would be ideal, but if it's not working this is just something else to try.
what other voltages and settings did you tweak when you were trying 133x30?

Here's the voltage settings that I had when I was running @ 133x30

CPU VCore: 1.218V
QPI/VTT: 1.215V
CPU PLL: 1.8V (Auto)
IOH Core: 1.1V (Auto)
DRAM Voltage: 1.5V
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post #19 of 19
11/12/12 at 3:53pm
Thread Starter 
I've tried testing with a higher base clock to no avail. I think I might just postpone overclocking to 4GHz until I get a more beefy PSU. I'll keep this thread updated.
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