Core i7/X58 Overclocking Thread

[kpablo]

what do you guys think?

is it worth it to sell my 3836A690 for like $200? And then pick up a new one from Microcenter at $230 hoping for a better OC?

Right now, im stable at 3.6/3.78 w/ turbo on 1.21vCore, but I need like 1.4vCore for 205+ BCLK.

Look like this is the most common case... the need of 1.4v to get stable at 4GHz...

[rge]

I have good news and bad news. The good news is that I got my new i7-940 in on Friday. The bad news is since I'm WCed, I didn't want to tilt my PC over to install it and when I tried, I bent a some of the pins on the CPU slot SOOO I had to buy a new MB. I had the Gigabyte X58 extreme(which I liked), locally I was only able to find an Asus P6T Deluxe. I'm still trying to get used to it. I can't find where you turn turbo on.

Well, this chip does 215+bclk with only 1.35 qpi/vtt. My old 920 needed 1.79+ for 210 bclk.

Right now, I'm running 4GHz(211 x 19) HT on with about 1.31 V(does that sound good, or it is a bit high?) - I'm still tweaking it a bit.

I'll try to get some pics when I have a chance.

That is what I need for 4ghz stable if talking cpuz volts, 1.31vcore cpuz, then 1.344 cpuz for 4.1, 1.376 cpuz for 4.2....mine has been a decent Ocer.

Regarding socket pins, I tilt my computer at ~45 angle (using small sturdy box, lay top against it), to prevent air from getting in via t-line but still makes it easy to change cpu. I bent socket pins on my P35 DQ6 doing same as you, trying change cpu out in upright position...but was able to bend them back with microscope and microforceps.

[theonlybabyface]

I've bent pins before as well and a mechanical pencil works perfect.

[The-Fox]

what do you guys think?

is it worth it to sell my 3836A690 for like $200? And then pick up a new one from Microcenter at $230 hoping for a better OC?

Right now, im stable at 3.6/3.78 w/ turbo on 1.21vCore, but I need like 1.4vCore for 205+ BCLK.

That sounds like a good chip, the chances you are going to get something better are low.
35/36/41 weeks are the good ones, so it seems.

Your i940 sounds promising, pump it up

[Factotum]

The 940 is 3838B125

nice CPU, Lucker =))

[roller11]

It's a differential voltage problem. If you start getting away from a .5v diff between the QPI/DRAM (Vtt) and the DRAM voltage it could cause damage.

Is there a problem with running more voltage on Vtt than Vcore? I'm asking because I'm running only 1.184 volts Vcore cause that's all I need to achieve 4011Mhz CPU clock. I have Vtt set to 1.215 which is getting close to the .5 differential WRT my 1.66V setting on my Vram.

[SteveRo]

From the i7 review by Rajinder Gill on anand - http://www.anandtech.com/cpuchipsets...oc.aspx?i=3502
- he said that 166 would be the sweet spot for 965 because of the ability to also get good oc on the memory.
So I started working on the 27 multi with the idea that I could pick up some DDR3 2000.
So I have been able to get 27x159 prime stable with HT on - pretty happy about that actually (see below).
So if I pick up some new 3x1GB DDR 2000, I should be able to run it at 159x12=1908?

[SteveRo]

Is there a problem with running more voltage on Vtt than Vcore? I'm asking because I'm running only 1.184 volts Vcore cause that's all I need to achieve 4011Mhz CPU clock. I have Vtt set to 1.215 which is getting close to the .5 differential WRT my 1.66V setting on my Vram.

someone double check me but I think the .5v delta is between qpi v and ram v, correct?

[Lukee]

someone double check me but I think the .5v delta is between qpi v and ram v, correct?

That is correct.

[SteveRo]

I'm going to pick up a new set of DDR3 1600-2000 3x1gb in a couple weeks - who makes the best set at this point?

[SteveRo]

That is what I need for 4ghz stable if talking cpuz volts, 1.31vcore cpuz, then 1.344 cpuz for 4.1, 1.376 cpuz for 4.2....mine has been a decent Ocer.

Regarding socket pins, I tilt my computer at ~45 angle (using small sturdy box, lay top against it), to prevent air from getting in via t-line but still makes it easy to change cpu. I bent socket pins on my P35 DQ6 doing same as you, trying change cpu out in upright position...but was able to bend them back with microscope and microforceps.

rge - how are you liking F5e? Did it get you anything over F4j or m?

[rge]

rge - how are you liking F5e? Did it get you anything over F4j or m?

I have not had a single reboot or other problem on F5e. So I like it and am using it. However, stability wise or benching, F4m, F4j, and F5e all the same on mine, requires same settings for same OC, and spi etc, no difference, max OC 4.922 same, and max bclk 217 same.

[SteveRo]

I have not had a single reboot or other problem on F5e. So I like it and am using it. However, stability wise or benching, F4m, F4j, and F5e all the same on mine, requires same settings for same OC, and spi etc, no difference, max OC 4.922 same, and max bclk 217 same.

what are you running your memory at now - speed and cas?
I am thinking of a memory upgrade

[roller11]

That is correct.

I understand that the .5 diff is between Vtt and RAM voltage. My concern is whether or not Vtt should be equal to or less than Vcore. If so, then Vcore would be indirectly affected by the .5 diff.

[SteveRo]

I understand that the .5 diff is between Vtt and RAM voltage. My concern is whether or not Vtt should be equal to or less than Vcore. If so, then Vcore would be indirectly affected by the .5 diff.

I have never heard that vcore needs to be set to anything vs qpi - intel max v that I know of -

[rge]

what are you running your memory at now - speed and cas?
I am thinking of a memory upgrade

I was on XP sp3 with corsair dominators 3x1 gb at 1600 stock 8,8,8,24 (8x200bclk). Now that I can use 6gb (changed to windows 7 64 bit permanently) I ordered 3x2gb OCZ platinum 1600 7,7,7 21 from newegg, due here on wednesday. Will be interesting to see how much more qpi/vtt I need for 6gb vs 3 of ram, currently only 1.31v for 21x200.

[SteveRo]

I was on XP sp3 with corsair dominators 3x1 gb at 1600 stock 8,8,8,24 (8x200bclk). Now that I can use 6gb (changed to windows 7 64 bit permanently) I ordered 3x2gb OCZ platinum 1600 7,7,7 21 from newegg, due here on wednesday. Will be interesting to see how much more qpi/vtt I need for 6gb vs 3 of ram, currently only 1.31v for 21x200.

how high qpi and mem v are you prepared to go?
do you think you really needed 6gb?
if at 3gb - when you go into vm - which should not be that often - you have .1ms SSD - I doubt you would ever know the difference.

[rge]

how high qpi and mem v are you prepared to go?
do you think you really needed 6gb?
if at 3gb - when you go into vm - which should not be that often - you have .1ms SSD - I doubt you would ever know the difference.

yeah, dont know that I will notice the difference, but I am one of those that has to try everything I am assuming I wont have to go all that high, but that is one of the things I want to know, and best way to do that is try both. But I will run at 4.1 minumum regardless, preferable 4.2

[Lukee]

This is the lowest my 940 can do on 211 x 19.

[JWMc]

This is the lowest my 940 can do on 211 x 19.

4ghz @ UNDER 1.3v load with HT on in LinX @ 210 bclk? Something is fishy!

[YukonTrooper]

4ghz @ UNDER 1.3v load with HT on in LinX @ 210 bclk? Something is fishy!

His BIOS voltage is probably around 1.35V. Also, base clocks seem to have a wide variation of ability board-to-board.

[JWMc]

His BIOS voltage is probably around 1.35V. Also, base clocks seem to have a wide variation of ability board-to-board.

Or chip to chip?

Hmm, you know what.. maybe I just screwed up and didn't test low enough voltages @ 4ghz. I just checked and I hit 4.2ghz @ 1.408v load so I may be able to get a pretty nice vCore @ 4.0..

[gatmaitan20]

Heres my settings
i920/ex58-Extreme/g.skill 1600 9-9-9-25/fuzion v2/mcr-320


Voltage:
1.375 vcore set in bios LLC enabled
1.41 QPI/VTT
1.86 PLL
1.66 Vdimm (probably could be lowered)
All other voltages Auto

21x200
Turbo enabled even under load (thanks f4j )
HT disabled
x36/x18/x8
PCI-E 101
CPU clock drive -800mV
PCI-E clock drive -900mV

Hope it helps

Hello I'm just wondering if could copy your profile, really a newbie when it comes to overclocking thanks...

[dejanh]

4ghz @ UNDER 1.3v load with HT on in LinX @ 210 bclk? Something is fishy!

No, actually my chip does the exact same thing. I just did a 20 pass run maybe 2h ago. Same clock, same voltage. I used memory at 1691, 7-8-7-20-1T timings, uncore at around 3800MHz give or take a few MHz.

LLC was on auto in my run. CPUZ reported voltage showed 1.288V (not completly correct, but then again, only a DMM is really correct).

If however I set 20x200MHz, I have to use roughly 1.3V.

It's funny that OC with higher BCLK actually works better than higher multipler. Completly opposite of what we should be seeing.

No wonder all the chips basically clock the same across the versions (920, 940, and 965 XE).

[SteveRo]

No, actually my chip does the exact same thing. I just did a 20 pass run maybe 2h ago. Same clock, same voltage. I used memory at 1691, 7-8-7-20-1T timings, uncore at around 3800MHz give or take a few MHz.

LLC was on auto in my run. CPUZ reported voltage showed 1.288V (not completly correct, but then again, only a DMM is really correct).

If however I set 20x200MHz, I have to use roughly 1.3V.

It's funny that OC with higher BCLK actually works better than higher multipler. Completly opposite of what we should be seeing.

No wonder all the chips basically clock the same across the versions (920, 940, and 965 XE).

concur - all chips about the same (I have the 965).
Also - lower multi with higher bclock also gives lower temps.