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Old September 25, 2014, 03:24 AM
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Default i7 920 (C0) overclock question.

Edit 3: OK not worth the hassle. Keeping it at 3.8

EDIT 2: Nvm it crashed lol. 0x124. Upped the QPI by 2 steps. Testing again.

-----------------------------------------
EDIT: OK so it was running too hot and needed too much voltage. I had concerns about stability at 4.0

So I tried this.

I upped the 3.8 to 3.9. Surprisingly it needed no extra voltage !!!!!

I then upped the RAM voltage from 1.51 to 1.64 and overclocked the ram from 1143 mhz to 1562 mhz

Voltages for 3.9Ghz

vCore: 1.35
PLL: 1.84
QPI: 1.275
DRAM: 1.64

Load line disabled (means vdroop enabled as per Intel spec?)

No clock skew or anything.

--------------------------------------------------------------------------------------------------------------

Hey guys. I mentioned this in the GTX 970 comment section but I have a few CPU questions so I figured I would post here.

I just overclocked my i7 920 to 4.0 Ghz (stock was 2.66). It has been stable at 3.8 Ghz for 5 years but I was afraid it would bottleneck a GTX 970. Cooler is coolermaster V8. Case is a Silverstone Fortress FT02. AMAZING case airflow.

Took a lot of time but I only managed to squeeze another 200 Mhz Had to up lots of voltages like Vram, QPI/Vtt, Vcore.
On the bright side, I managed to overclock my 6 sticks of 12GB ram from 1.1 Ghz (previous 3.8ghz overclock) to 1.53 Ghz.

1) This should be good enough for a GTX 970 for now right ? Should I risk melting my i7 920 for another 100-200 mhz ?

2) My CPU temps are fairly low at 4Ghz.

- Around 40C Idle.
- Unigine Valley benchmark they hover around 45-50C
- But during IntelBurnTest, the hottest core hit 92C.

Is this ok ? I know there is no way gaming will hit that kind of temperature. So 4Ghz is safe right ?

3) Are these voltages safe ? I kept getting lots of 0x125 and 0x101 crash codes so I had to raise the voltages.

Vcore - 1.425
PLL - 1.84
QPI/Vtt - 1.375
Vram - 1.64

Thanks !

Last edited by THS; February 3, 2015 at 10:10 AM.
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Old September 25, 2014, 06:54 AM
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That should be fine. QPI/VTT seems unnaturally high. Is that a typo?

VCore should be ok. For these chips 1.425 is still relatively safe as long as temps don't exceed the mid 70 celsius range at high loads. That's actually a good overclock for a C0 chip.

The performance loss unless you are at low details and low resolution would be minimal, because if you are playing strenuous games at high details, they will likely be somewhat GPU limited.
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Old September 25, 2014, 07:34 AM
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Any older tech is going to be a bottleneck at times, but it would still be fine to upgrade the GPU. Most graphics intensive games are limited by the GPU.

As for the OC, obviously higher is better to eliminate a chance of a CPU bottleneck, but given that you had to push all voltages to get stable at that speed I would be inclined to back it off a touch. For me I would take it down to 3.9 or so, and lower the voltages as much as you can. I don't like having voltages near limits. 100mhz is not going to make a substantial difference in any scenario.
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Old September 25, 2014, 08:34 AM
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It all depends on the games..

Something like BF4 might be CPU limited but 90% of games will be card limited (or probably monitor limited) before the CPU, Personally I would pull it back to your 3.8 oc.
3.8 is good for a 24/7 oc. Pushing the voltages that high and your reducing the life of the chip for what is a benchmark increase (you will see no real world differences)
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Old September 25, 2014, 01:30 PM
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Quote:
Originally Posted by 10e View Post
That should be fine. QPI/VTT seems unnaturally high. Is that a typo?

VCore should be ok. For these chips 1.425 is still relatively safe as long as temps don't exceed the mid 70 celsius range at high loads. That's actually a good overclock for a C0 chip.

The performance loss unless you are at low details and low resolution would be minimal, because if you are playing strenuous games at high details, they will likely be somewhat GPU limited.
Yes typo. 3.75 lol it would melt. It's currently at 1.375
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Old September 25, 2014, 06:05 PM
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For a C0, they're pretty happy at 3.8. It just takes too much of a voltage jump to hit 4.0, thus why you're hitting above 90C... 90s is a bit on the high side, try and keep it in the 80s. While you're gaming I doubt you'll be pegging the CPU anyways at 100%..

Kind of a toss up, personally I'd keep it at 3.8 (which is what I've done for years) and run with the peace of mind that your temps are better, vcore is down, and you can squeeze a few more years out of the original i7! hell my vcore at 3.8ghz is a full 0.1 lower than yours at 4.0. That's significant.

You're not the only one that had a hard time at 4.0 with a C0
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Old September 26, 2014, 01:22 AM
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Quote:
Originally Posted by Bond007 View Post
Any older tech is going to be a bottleneck at times, but it would still be fine to upgrade the GPU. Most graphics intensive games are limited by the GPU.

As for the OC, obviously higher is better to eliminate a chance of a CPU bottleneck, but given that you had to push all voltages to get stable at that speed I would be inclined to back it off a touch. For me I would take it down to 3.9 or so, and lower the voltages as much as you can. I don't like having voltages near limits. 100mhz is not going to make a substantial difference in any scenario.
Awesome idea. Thanks !

It appears that 3.9 is taking similar voltage as my 3.8 OC.

I did up the RAM from 1.1ghz to 1.5Ghz so I upped the VRAM voltage from 1.51 to 1.64 (my Corsair XMP states 1.65 anyway for 1600)

It crashed after running IntelBurnTest at extreme setting for a while with 0x124 which indicates QPI so I upped that by 2 steps.

Will update with final results @ 3.9 Ghz. So far it seems MUCH easier to hit than 4.0
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Old September 26, 2014, 05:01 AM
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Good to hear that it seems to be working out. It always takes a bunch more voltage to get that last bit out of a CPU, so by backing it down that little bit it can ease of up on heat and lower power consumption quite a bit (because of the lower voltage).

If you have time to play, once it seems to be stable then try backing each voltage down as much as possible without a crash.
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Old October 1, 2014, 11:44 AM
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Not uncommon at all to see those chips want to stop at 3.8ghz

Most people settle @ 3.8ghz just because it requires so much less voltage and that means less heat overall and less chance of random lockups / bluescreens and what not.

It can be a real pain when your CPU is riding on the bleeding edge of its overclocking potential.

One day it will be great the next it will act up.

If your cpu requires alot less volts and runs cooler @ 3.8 then stay at 3.8ghz

Sometimes its your other voltages on board that holds them back though not just QPI and vcore.

My 930 Is @ 4.0 on a Hyper212 but i had so many issues getting it there , it was kind of a nightmare until i figured out what was wrong and it was a odd voltage that saved my overclock .. i cant remember exactly what though off hand.. that pc is unplugged atm and is a spare and i havent used it in 2 years or so.
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Old February 3, 2015, 10:07 AM
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Agreed with everyone. Settled at 3.8. Even 3.9 needed much more voltage.
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