i5-2500K OC + RAM OC

[Ya93sin]

Doing this on my new build,

Mobo-ASUS P8Z687V-PRO

CPU-Intel i5-2500K

RAM-Mushkin Blackline 8GB

This is going from stock, 1.224V for the CPU @ 3.3GHz stock, 3.7GHz turbo, 100.3 base clock, Ratio 16-37 (underclocked-turbo).

So for the overclock, I used the ASUS in-BIOS tuner, and got:

(at 1.248V CPU voltage)

• 3.43GHz 'normal' clock (at 33x multiplier)
• 4.32GHz 'Turbo' clock (at 42x multiplier)
• 103.0MHz BCLK
• Ratio 16-42 (underclocked-turbo)
• iGPU is 1450MHz instead of 1100MHz, it just did this automatically, I care only if its inhibiting the CPU OC potential)
• RAM is now 9-9-9-24 @ 1648MHz, 1.35V as before, so effectively a 48Mhz increase, but I think that's due to the BCLK increase by 3MHz)

Temperatures are not much higher at all, going to test with Prime95 to see the difference at 4.3GHz.

Is this what I should be expecting? I was wondering whether I should just disable the iGPU so that the CPU can overclock better.

This is a 24/7 OC, also I'm wanting to keep the underclocking-turbo modes instead of one constant frequency, at least until uni.

Also should the voltages be lower?

Of course I'm going to do some of my own research, test it properly now, but I would very much welcome your thoughts and feedbacks.

Thanks

 

[SieB]

Those volts are ok for 4.2ghz but you should do it manually (not with auto tune) and go for 4.5ghz. Just set the multi to 45 and try the volts you have for your OC at the moment, if you get a BSOD then you need to up the volts a bit just go up 0.0050v at a time. So if you are using 1.224v at the moment and it's unstable try 1.2250v then 1.23v 1.2350v 1.24v 1.2450v etc etc.

Anything below 1.38v is 24/7 safe but for 4.5ghz you shouldn't need more than 1.35v for 4.5ghz it's usually between 1.25v and 1.35v depending on how good your CPU is.

The IGP shouldn't affect the ability of the CPU OC but if you don't use the IGP you might as well disable it.

 

[Ya93sin]

Only reason I actually have it still is because I need to convert videos before YouTube upload, but I'll try to see if I can lower the volts with the iGPU off.

I hope I'm not going anywhere near 1.35v tbh, don't want the extra heat

Also, I bluescreened at 4.5Ghz on 1.248, so I suppose 4.4GHz is going to be around the limit at that point.

Will keep you guys updated, and thanks for your help Sieb

 

[SieB]

Only reason I actually have it still is because I need to convert videos before YouTube upload, but I'll try to see if I can lower the volts with the iGPU off.

I hope I'm not going anywhere near 1.35v tbh, don't want the extra heat

Also, I bluescreened at 4.5Ghz on 1.248, so I suppose 4.4GHz is going to be around the limit at that point.

Will keep you guys updated, and thanks for your help Sieb

No probs

Your temps should be fine even at 1.35v though, my 2500k is at 4.5ghz @ 1.35v and my temps are 55c* max with my D14 and the fans on silent.

 

[Ya93sin]

I think my normal temps are too high, its been around 36 idle today before the OC, about the same now. Don't know if this is all due to the high ambient temperature, but I guess I'm gonna find out

 

[Ya93sin]

Ok, ran prime95 for 30mins, large FFTs on the Torture Test

Just before test-37/39/35/39

After test-51/57/54/58

Deltas-14/18/19/19

Package Delta-23 (from 38 to 61)

Gonna go play in the BIOS now

edit-this is on the above OC

 

[Ya93sin]

Do you reckon its good for a 24/7 OC to have BCLK Frequency at 104.8MHz?

Should I just lower to 100MHz and just tweak the multiplier? I know that's the tried and tested option, but then I guess the RAM is also sped up by increasing BCLK...

Atm, I have that BCLK Freq., Core Voltage at 1.272V, 3879.4MHz core speed (37x multi), similar temperatures to above as I run prime95 on it now.

EDIT:blue screen at 42x multi, 104.8 BCLK, will keep you updated.

 

[SieB]

Best to leave the BCLK at 100 and just up the multi, I have read that you shouldn't mess with the BCLK for SB and that 103 is as high as you should go.

I've found that the temps don't really change that much from 1.25 - 1.35v maybe 1-2c but when you go closer to 1.37 - 1.38v then they go up a bit, I think the IGP may add a bit of heat as well but i'm not sure because i'm on a P67 board so my IGP isn't active.

 

[Ya93sin]

OK, done the following:

Disabled iGPU (not needed I don't think)

Reset BCLK to 100.0

Set turbo ratio to 44x

DDR3-1600MHz memory frequency

Set the latency of the RAM to 8-8-8-24 (still at 1.35V)

Left all voltage controls alone

EDIT-again a blue screen, will change back the RAM to default (PAGE_FAULT_IN NON_PAGED_AREA) and increase voltage

 

[SieB]

OK, done the following:

Disabled iGPU (not needed I don't think)

Reset BCLK to 100.0

Set turbo ratio to 44x

DDR3-1600MHz memory frequency

Set the latency of the RAM to 8-8-8-24 (still at 1.35V)

Left all voltage controls alone

That should work, just might need to up the volts a bit to get the CPU stable but if it will run stable at stock volts even better

 

[Ya93sin]

I think its liking 1.320/.328V, it auto-settled on that, whatever the stock was, was probably a bit too low. I think the mobo will adjust voltage automatically, as you have to leave Speedstep/Turbo on (apparently) to overclock. Will run prime95 now. Thanks again for your help

 

[Ya93sin]

OK, so I've run 30mins Prime95, looks solid, at the following settings:

100MHz BCLK Freq.

44x Turbo Multiplier

1.320/328V Core Voltage

Used HWMonitor to see temp values, ASUS AI Suite II to record the temp fluctuations, CPU-Z to see the Core Voltage.

Prime95 to test, Torture Test, in-place large FFTs, 30minutes.

Temperatures:

1. Just before Prime95: 41/37/35/38/Package:45
2. After 30mins Prime95: 53/60/58/61/Package:64
3. Idle after Prime95: 36/37/36/37/Package 36

Delta between 1 and 3: 12/23/23/23/Package:19

Delta between 2 and 3: 17/23/22/24/Package:28

I think this is OK, and in actual fact I'm predicting my idle temperatures tomorrow are going to be lower than they have been before.

I may go for a 4.5GHz Turbo OC, I'm going to check if there is any fps gain (especially the min. fps values). Will put that in my project log

 

[Ya93sin]

True story, today I got back from the barbers, then I was on the PC (which had been left on), noticed the room was a bit warm, PC wasn't as responsive as normal, checked my temps.

So they were touching 60deg. So I sat there like omfg

, thought maybe it was the silent fan profile from AI Suite II, but then I looked in the system tray area, turned out prime95 had been running for an hour

And also, my idle temps seem to be lower now, which is odd

 

[SieB]

True story, today I got back from the barbers, then I was on the PC (which had been left on), noticed the room was a bit warm, PC wasn't as responsive as normal, checked my temps.

So they were touching 60deg. So I sat there like omfg

, thought maybe it was the silent fan profile from AI Suite II, but then I looked in the system tray area, turned out prime95 had been running for an hour

Lol

 

[Ya93sin]

Finally settled on 4.5GHz, 100MHz BCLK, will overclock the RAM today (I'm going to go for higher frequency as opposed to lower latency, see where it takes me).

CPU-Z