factors limiting my overclock.

footman · 16 Jun 2006 at 21:36

Ive swapped the opty 146 for a 165 CCBBE 0610DPMW), everything else is the same.
After several days messing about Ive got it (on air) to 9x295=2.655GHz.
The memory is running at 241.4 (166MHz) 3 3 3 7 1T
voltage is 1.5v temp is 42 degrees. raising the voltage is still no go.
HT linkspeed 1GHz (ie x5)
It wont load Windows above 295 and at 295 Prime 95 runs merrily when not testing much RAM at a temp of 47.
When testing RAM Prim495 falls over within seconds.

So, does this mean that the mobo max's out at 295 or the RAM is pushed too far? (tomorrow Im getting 2g of Corsair 4400)

If I put the 165 on water (all the kit arrived today..scared!) will the mobo limit anything above 295?

thanks for looking

footman · 16 Jun 2006 at 22:25

I lowered the cpu multi to 8 and got up to 8x298=2384 with the memory at 238.4. If I lower the memory speed to 133 it wont boot.
I then tried to restart but the pc wont even post so I guess its reset the cmos time!
So as the RAM was running lower than when at the stable overclock can I assume that the RAM is not the limiting factor here, but the mobo max's out at 297?
Would this mobo,DFI LanParty UT CFX3200-DR RD580, known to go somewhat higher than 300 be the answer?

footman · 16 Jun 2006 at 22:54

hmmm, thats dissapointing, I was really hoping to get more than 2.65GHz from this cpu!

footman · 17 Jun 2006 at 07:00

Gashman said:
i doubt it, i think you've just reached the limit of your CPUs actual potential, in which case getting a better clocking board wouldn't help at all

I know I should just go away and shut up but the "math doesnt add up" (apologies to Saving Ryans Privates)

The CPU speed when the PC failed to post was 2.376 (8x297) and as Id got it Prime stable at 2.655 when using the stock multi of x9 then it couldnt have been the cpu that was maxxed out.

footman · 17 Jun 2006 at 09:24

iraiguana said:
did u lower the htt link speed to below eight ? as around the 300mhz barrier it needs to be 600 (3x). and u could lower it further still.

ahh....If I recall it was set at 1GHz (x5). I'll give it a try later, cheers.

footman · 18 Jun 2006 at 23:14

jmhduck said:
Agreed you need to keep the htt below 1Ghz

I left evrything on auto to see what would happen and its now set to 400MHz. Its prime stable (24 hrs) at 295 but everything goes weird at 296!

Im getting the DFI crossfire board to see if that can take the HTT higher.

footman · 20 Jun 2006 at 19:29

jmhduck said:
Yep DFI should be better, was about to suggest sli-d but not with those 2 beastie gfx's

cheers for that m8, havnt got the board yet, will let you know when it arrives.