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2500k @ 4.5GHz. What volts?

daveash

daveash

daveash

Associate
Joined
18 Mar 2011
Posts
325
Hey all, I've got my 2500k at 4.5GHz. However, it needs 1.320v to get stable (that's with LLC, so barely any vdroop). This seems a little high compared to what many others have posted around the place. My temps are OK (67c max after hours of Prime) but I won't be able to push it to 4.7 as it needs a lot more volts just to boot into Windows.

Those of you with similar overclocks, what voltages are you using? Are mine abnormally high?
 
Seems high for 4.5ghz. Mine is at 1.27v, it was the first voltage I tried and just left it as it worked through Prime, SuperPi and numerous gaming benchmarks, so may be able to squeeze lower. Most chips seem to be fine at that clock speed at 1.27v to 1.28v.
 
I was using 1.3v for 4.6ghz and now 1.35v for 4.8ghz and everything is stable. You maybe need to adjust more than just core voltage though. I use an MSI board so I can't really say which ones you would need for your ASUS but mine are:

48 x
Core 1.35v
CPU IO (VCCIO) 1.17v
System Agent (VCCSA) 1.185v
PLL 1.9v

Enable: Execute Disable Bit, Intel Virtualization Tech and C1E Support
Disable: Limit CPUID Maximum, Power Technology and OverSpeed Protection.
 
thunderflash said:
I was using 1.3v for 4.6ghz and now 1.35v for 4.8ghz and everything is stable. You maybe need to adjust more than just core voltage though. I use an MSI board so I can't really say which ones you would need for your ASUS but mine are:

48 x
Core 1.35v
CPU IO (VCCIO) 1.17v
System Agent (VCCSA) 1.185v
PLL 1.9v

Enable: Execute Disable Bit, Intel Virtualization Tech and C1E Support
Disable: Limit CPUID Maximum, Power Technology and OverSpeed Protection.
Click to expand...

Right, my ASRock board has these options:

CPU IO (VCCIO) 1.17v
System Agent (VCCSA) 1.185v
PLL 1.9v

But what exactly do they do?
 
I just left volts on auto and bunged the multiplier to 45, job done :p

4.5GHz, 71 under load, 37~ idle/normal, 650-950rpm fans :D
 
Idle: 1.2v or so last I looked
Gaming: 1.33v

What fans you using?

I wouldn't mind upgrading mine to some low RPM but high airflow 120mm fans. I reckon sub 60 when gaming with fans that are like that and ~room temp for idle!
 
bedazzled said:
Mine only goes to 4.4 at 1.320 volts any higher clock speed and it's BSOD time as windows tries to start, the board is an Asus P8P67.
Click to expand...


mine stable 4.4ghz 1.3v,
I tried for 4.5ghz and went as high as 1.35v to get 4.5ghz but could never get it stable, I dont want to push volts higher than 1.35v.

so sticking with 1.3v @4.4ghz

im using asus p8p67-m

33-35c idle, 51-57c load, hyper 212 plus
 
Khaaan! said:
Idle: 1.2v or so last I looked
Gaming: 1.33v

What fans you using?

I wouldn't mind upgrading mine to some low RPM but high airflow 120mm fans. I reckon sub 60 when gaming with fans that are like that and ~room temp for idle!
Click to expand...

Sorry I tell a lie, my Noctua fans are 1300rpm but still silent. Stock fans on Noctua NH-D14 Cooler, 2 x NZXT 200mm case fans, 3 x NZXT 120mm case fans, 1 x 140mm NZXT fan & 1 x Xigmatek 200mm side fan. Ambient just now 22.8c and CPU & GPU maxed on folding. CPU @ 58c my GPU puts my case temps up by 7c when maxed so doesn't help but still ok. I have been to 5.1ghz at 1.45v and still didn't go above 70c
 
cooper795 said:
I used that guide for the GA-P67A-UD4 and it wouldn't boot :mad:

I think the DRAM voltage was way too high now I come to think of it, 1.65 when 1.5 is recommended as the highest?
Click to expand...

I Have Corsair XMS3 and I too set it to 1.65v as that's what it says on the RAM modules but had a lot of blue screens, put it to 1.5v and has been fine since. PC been doing IBT for over 10 hours and is fine at 4.8ghz and 1.35v :D
 
thunderflash said:
I Have Corsair XMS3 and I too set it to 1.65v as that's what it says on the RAM modules but had a lot of blue screens, put it to 1.5v and has been fine since. PC been doing IBT for over 10 hours and is fine at 4.8ghz and 1.35v :D
Click to expand...

I may have a look at it again then, and set it to 1.5v and see how it goes :D
 
that is perfectly fine for 4.5ghz. recent chips have needed a little more juice but nothing that will do any harm.

as is the norm with intel. initial batch is usually brilliant and then later batches need more of a tickle to get results. no biggie.

my 2600k runs at 1.4v 24/7 so i wouldnt worry yourself.
 
thunderflash said:
Lol no idea, I used this guide to get to 4.5ghz then just upped the CPU voltage to get a stable 4.8ghz
Click to expand...

Good guidelines for MSI OC. I'm on GD53 board, and was struggling to get stability above 4.4GHz at 1.35v. Managed to get stability at 4.7GHz, at the same temps as before (surprisingly). Probably only need a small nudge over 1.35v now to get to 4.8GHz, but I'll have a bash at that when I have more time.
 
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