GPU OC limiting CPU OC potential?

So ever since flashing from 213 Ive been able to get my PLL (using setFSB) from a cap of 161 to about 185 which equates to about 1960MHz. Everything has been stable until I started playing the Witcher 2 and decided to OC my GPU as well. First I was using clocks of 750/1050 for the entirety of the prologue and chapter 1. Then eventually raised it to 800/1100. Then I started getting these black-screen pauses. Well after a restart I raised my clocks even more to 835/1100 just to confirm it and nothing happened. No more issues.

...thats when I noticed I didn't have my CPU OCed...

GPU OC's automatically for me on startup but not Setfsb. So i was able to beat the remainder of Witcher 2 (since I couldn't put the game down) with 830/1100 clocks. Anyway, now im trying to get an OC of at least 1.9ghz which is at 177PLL for me. Well, thats my new highest stable with gpu clocks of 835/1100 because now if I ever go past 177, I BSOD eventually. Not to mention 184+ hardlocks my rig when this used to happen at about 188.

...So I lower my GPU clocks to 780/1080 and now i was able to get the CPU to 180 stable. Then for kicks I went back down to gpu stock clocks and what do you know i was able to get back to 185pll.

So unless im the only one with the issue.....voltage limitations I presume?

 

You're not alone, but as you said, I am fairly certain its just a power limitation.

I cant put my computer under load when I am at both max OC's. I can only go 870/1150 when my CPU is at stock, and about 820/1100 when it isn't. Though I havent tried both at once, since I received my new adapter, might be just enough.

 

Dont forget that if you raise the BCLK you'll raise it for everything. Including the PCIe slot your GPU connects to. Which in turn will make the GPU unstable or not able to cope with I guess.

This is just my guess guys. Maybe somebody else can shed some light on this.

 

I had also sent a PM to J00zl33t about not removing any RAM modules. I've was try to find if I removed a module of RAM if I could go higher. So I tried, and it failed. It also screwed with my ability to get back to 168 PLL once I put the RAM back in. So I downgraded back to BIOS 211, and everything is good.

In my case I can't get as high as him since I still have the stock 1066. iemie is right in that when you raise the BCLK it does affect other things. In my case I can't OC my GPU any higher than 755/1055 so it isn't worth it at all. Currently with the 168 PLL and the stock power brick I'm running the memory at around 1210-1225 (153*4*2). I know I could get more if I had some better RAM. Here is a quick picture of Everest OverClock showing my RAM speed.