Per core overclocking

[Smithy1294]

Hey guys, just a quick question, i currently have my CPU running stable, however it is running 3 cores at 45x and one core at 44x, is this optimal, the 4th core doesnt seem to want to go over 44x without a BSOD? will the 3 cores work at 45x whilst the one runs at 44x? Sorry i've never really messed with per core overclocks before 😛

Also, CPU Cache, is it better to be higher or lower? im guessing higher but i've currently left mine at 35x

Bclck is 100mhz btw 🙂

Thanks

[jab383]

We'll need a few more details to be of real help - motherboard and CPU to start.

Guessing that you have a Haswell, they are all different and need to be individually stroked. I haven't personally had a case where one core had to lag behind the others to avoid blue screens.

Cache is better higher, but only by a little. It's often best to leave cache clock low to avoid uncertainty when the setup crashes. After you get a stable core overclock, then raise cache. Most commonly, cache ends up 200 to 300 MHz lower than core with about the same Vcache as Vcore.

Jeff

[Smithy1294]

Motherboard - Maximus VI Hero
CPU - I7 4770K

[Smithy1294]

huh, i've literally been testing this setup all morning, just did another stress test and get WHEA_UNCORRECTABLE_ERROR which is the vcore error right? i'll try bumping my vcore up but like i say i've had it working fine all morning o.O

[Smithy1294]

Nevermind i think its AI Suite 3 lying to me, in bios all cores are at 44x

[Tokens210]

the haswells are super touchy, i had mine running 45 on all cores with a min max cache of 45 on 1.380v and it worked flawless and stable for like 3 days then wouldnt boot anymore till i bumped it to 1.400v

also the processor can ramp up or down if you have balanced power plan on (this is the plan you want for everyday use)
meaning it may show different cores at different speeds depending on what there doing at that time

to answer your cache question, closer to your core number is better
meaning you have 44 on all cores
then 44 or closest to 44 as you can get would be best
problem is with some of these chips they cant push a "native" cache as its called without a butt load more power


so heres how youd wanna go about it
1. remember your current setup just in case
2. in bios load optimized defaults (sometimes you dont need to, but its usually best to wipe other setting out first cause some can actually stick)
3. sync all cores (44)
4. min/max leave on auto for now
5. voltage go manual and start at 1.200v work you way up by .025 so (1.200, 1.225, 1.250, 1.275, 1.300) until the pc will boot you didnt list what kind of cooler you have so id say for now just keep checking temps and dont just jump into anything higher then 1.380 just yet till you know you can cool it
6. once pc boots run a stress test or even the realbench benchmark test, have a temp program like realtemp, something that show you core temps as ai suite is only showing you cpu package temp and your actual temps are probly much higher then its showing
7. if it crashes and your temps were ok, increase voltage a little, try again
8. if it doesnt crash and alls good, slowly start raising the min/max cache up to 44, by default it should be at 39 so start there 39 on min/max cache boot and test
9. if it fails and temps are good go a bit more voltage, if it passes raise the min/max to 40 and try again, so on and so forth

as i said above some of these chips its hard to get the min/max to match the cores without a lot of power so you may end up a bit lower


i personally max at out 45 on all cores but my min/max has to be 44 or it requires so much power i cant cool it good enough and im running a 360mm closed loop cooler