Core i7/X58 Overclocking Thread

[mremulator]

try enabling HT and see where your temps go. HT adds ~10-15°C, plus you need to increase Vcore to get the same clock stable.



I haven't said its not possible, but look at your temps, all above 90°C in summer you will run 100% into the point where the cpu beginns to throttle.

Plus your on a 965 which is binned better.

HT on = 76-79c tops, even @ 1.52v, however, it blue screens within 4 minutes. Don't wanna go higher.

So I guess it's 3.8GHz HT on + cool rig... or 4.0GHz HT off + hotter temps? I still think watercooling the NB/SB may help. Just waiting for Bitspower to release their new block.

[Hornet331]

You wont get much benefit form WC the IOH (NB), even with 200mhz qpi clock it tops out at ~60°C with passive cooling.

[mremulator]

You wont get much benefit form WC the IOH (NB), even with 200mhz qpi clock it tops out at ~60°C with passive cooling.

So what could I try more QPI volts more IOH volts?

[SteveRo]

Just for the record - 4ghz nehalem is absolutely a doable do on air.
max temp, prime stable -
4ghz HT on - 86C
4.1 HT on - 97C
4.0 HT off - 66C
4.3 HT off - 78C
However, Hornet331 does make a good point - it is now winter where I am - so next summer (in Virginia) - I will want to keep an eye on my house air conditioner.

[mremulator]

Just for the record - 4ghz nehalem is absolutely a doable do on air.
max temp, prime stable -
4ghz HT on - 86C
4.1 HT on - 97C
4.0 HT off - 66C
4.3 HT off - 78C
Hornet331 does make a point - it is now winter - so next summer (in Virginia) - I will want to an eye on my house air conditioner.

Ok, looks like temps are not the issue for me, so what can I safely go to Vcore wise for 24/7 use? Intel say 1.55v Max?

Thanks guys.

[SteveRo]

mremulator - intel specs -

[Hornet331]

Ok, looks like temps are not the issue for me, so what can I safely go to Vcore wise for 24/7 use? Intel say 1.55v Max?

Thanks guys.

whats your qpi voltage?

also at what speed runs your NB.

[mremulator]

whats your qpi voltage?

also at what speed runs your NB.

1.35v & 3200MHz respectively. QPI is 3600MHz so 8:9 ratio.

[Hornet331]

try increasing volts on qpi if you want to go with 4ghz.

[speckled10]

mremulator - intel specs -

Now this is what confuses me .. p.22 of the spec says absolute max 1.55V .. but then p.23 p.24 give a formula that implies Vcc <= 1.375V (depending on load .. )




So what gives ?

That spec posted by SteveRo also implies Vtt <= 1.35V absolute max - but most of us are running above that ..

[ante_ante]

Does HT off the computer slower ?

[icecold316]

I got my i7 920 after the RMA, I was hoping for a B batch. But ended up with 3841A431. Anyone got this batch here?

[Chicken Patty]

I got my i7 920 after the RMA, I was hoping for a B batch. But ended up with 3841A431. Anyone got this batch here?

i got an "a" batch myself, nothing wrong with it, great chip IMO 4.2 GHz stable. "b" batches supposed to be better?

[Chri$ch]

i don´t need high end memory for good OC results....

3GB Micron D9JNL (~$70 ) @ 2.0v vDimm @ Core i7

[speckled10]

i got an "a" batch myself, nothing wrong with it, great chip IMO 4.2 GHz stable. "b" batches supposed to be better?

Chicken - have you ever posted your full BIOS settings for that stable 4.2Ghz OC ??

If not could you .. or PM me ?

[Chicken Patty]

Chicken - have you ever posted your full BIOS settings for that stable 4.2Ghz OC ??

If not could you .. or PM me ?

here are my voltages

http://www.xtremesystems.org/Forums/...postcount=1379

other than that, all power saving features off, HT enabled, QPI link at 4,800 g/t's. 200*20 plus turbo mode makes it a multi of 21 resulting in 4.2 GHz



http://img.techpowerup.org/081229/gr444.jpg

[icecold316]

i got an "a" batch myself, nothing wrong with it, great chip IMO 4.2 GHz stable. "b" batches supposed to be better?

As per the members who has B Batch, there were able to Overclock with less CPU voltage.

[Chri$ch]

@ Chicken Patty

Why do you have such a low CPU Score @ 3DMark06? Or is it Vista?

[Chicken Patty]

As per the members who has B Batch, there were able to Overclock with less CPU voltage.

Thanks. Didnt know that

@ Chicken Patty

Why do you have such a low CPU Score @ 3DMark06? Or is it Vista?

Vista, but also my memory, Im assuming tri channel helps and the mem at 1000 Mhz also, I would say.

[ReverendMaynard]

@ Chicken Patty

Why do you have such a low CPU Score @ 3DMark06? Or is it Vista?

Definitely Vista mate, I get the exact same cpu score at the same clocks.

[Chicken Patty]

Definitely Vista mate, I get the exact same cpu score at the same clocks.

gotta be, thanks for the post

[Hot'n'Chilly]

Hi guys, I posted my results in the other i7 thread first by mistake, but heres my first OCing settings for all you to check out. A lot of it was guess work, so I hope it all makes sense. The voltages especially were guesses, I still don't really get how to tell the exact amount I need.

CPU Ratio: 17
BCLK: 195
DRAM: 1563mhz
UCLK (UnCore): 3322mhz
QPI: 7038 MTs

CPU Voltage: 1.2375v
PLL Voltage: 1.9c
QPI (unCore) Voltage: 1.4v
DRAM Voltage: 1.62v

I'm using a i7 920 on an Asus P6T with OCZ Platinum DDR3 1333 RAM (7-7-7-20 timings)

[eva2000]

i don´t need high end memory for good OC results....

3GB Micron D9JNL (~$70 ) @ 2.0v vDimm @ Core i7

http://www.abload.de/img/superpi-32moisn.png

nice my 3x D9GTRs

[speckled10]

@ ChickenPatty - thanks for the info re: volts

Are you still running 1.35V CPU ?? Your screenie above shows 1.41V

Also what is Vtt +300mV ? Does this mean 1.65V (ie 300mV above CPU ?)

Definitely Vista mate, I get the exact same cpu score at the same clocks.

Wow .. is Vista *really* this bad across the board for dragging CPU's down ???

I see the same thing with JP's Chess Benchmark .. 10% slower in Vista over XP .. pretty shocking really ..

Are there any apps that are optimised for Vista .. or is it a fact of life that *everything* will run 10% slower thanks to the overhead in the OS ..

[Chicken Patty]

Definitely Vista mate, I get the exact same cpu score at the same clocks.

@ ChickenPatty - thanks for the info re: volts

Are you still running 1.35V CPU ?? Your screenie above shows 1.41V

Also what is Vtt +300mV ? Does this mean 1.65V (ie 300mV above CPU ?)



Wow .. is Vista *really* this bad across the board for dragging CPU's down ???

I see the same thing with JP's Chess Benchmark .. 10% slower in Vista over XP .. pretty shocking really ..

Are there any apps that are optimised for Vista .. or is it a fact of life that *everything* will run 10% slower thanks to the overhead in the OS ..

bro, those voltages I kinda just got them off a guide in the EVGA forum, i'm not too familiar with them, I just know the computer was stable. But having them set manually and not knowing what they did scared me, so I set everything back to auto except vcore and started the overclock all over again. Heres what I have so far, little by little, if you see I am upping the BCLK at 5 MHz at a time. I still haven't ran any benches to test stability at the clock I am now which is 167*21 = 3.5 GHz. I am trying to find the best clock for the CPU so far, notice I am running RAM by SPD's currently exactly by specs. 9-9-9-24 @ 1333 MHz. Once I get the CPU where I want it, i'll focus on tweaking the RAM, the less and smaller the changes, the easier it is to catch a mistake or instability