955 black edition CPU/NB default frequency/multi?

Tazzfalcon · 11 Apr 2011 at 21:44

Hi all,

Got my overclock ready setup running and currently running prime on a 3.6ghz overclock (4 workers standard stress test - 1st ever stable OC for me I hope!). Seems very stable so far at 1.344v though this seems to be fluctuating slightly :eek:

and currently only at a steady 44c! (hopefully be ok on prime for a few hours!)

Assuming this works I want to try raising the CPU/NB frequency for gaming performance boost but my mobo bios doesn't show the frequency imcrements only a multiplier value...?

What is the stock CPU/NB frequency and multiplier for these chips?

I have googled but there is so much information on these chips out there I can't see the wood for the trees. If anyone has a link to the complete rundown of stock settings/frequencies for the 955 that would also be much appreciated!

Many thanks and I look forward to calling myself a true member of this OC forum shortly

ran_out · 12 Apr 2011 at 09:10

Stock frequency is 2000mhz, can't say about what stock multi is though as I don't have visibility of this in the bios for my board, just sets by mhz.

Also I think stock volts for CPU-NB are usually at about 1.2 - but i'm not certain so don't quote me on that,

Tazzfalcon · 12 Apr 2011 at 09:41

Thanks Ran_out

Can anyone confirm whether the thing you multiply to get the CPU/NB frequency, is the NB Frequency?

Cheers!

Azuse05 · 12 Apr 2011 at 10:05

Install overdrive, that will give you the nb vid (1.1 here).

Tazzfalcon · 12 Apr 2011 at 10:18

Azuse05 said:
Install overdrive, that will give you the nb vid (1.1 here).

I've got overdrive but I'm not using it. I don't know what nb vid is... isn't that a voltage thing?

I'm just after the cpu/nb multiplier and corresponding frequency increments: What it is that I would actually be multiplying?

Azuse05 · 12 Apr 2011 at 10:40

Oh, sorry. I'm pretty certain it's a 10x multi by default.

In general the CPU NB clock should be at least three times the Memory clock (example in case of DDR3-1600: 3 x 800MHz = 2400MHz NB clock).

http://game.amd.com/us-en/content/pdf/AMD_Dragon_AM3_AM2_Performance_Tuning_Guide.pdf

on page 12

ran_out · 12 Apr 2011 at 11:43

Yeah 10x looks right, I think it's 10x the bus clock speed of 200 - as if you change this value it will also affect the CPU-NB speeds, correct me if i'm wrong though.

Tazzfalcon · 12 Apr 2011 at 11:46

Thanks both - exactly what I was after!

Hopefully I can get that up to 2600mhz on a multi of x13 and get is stable with some voltage tweaking. Then might aim for 3.8ghz core speed depending on temps!

Azuse05 · 12 Apr 2011 at 12:42

Nah, you're going too fast. Only change one thing at a time, make sure it's stable before you change the next thing otherwise you won't have any idea what's causing instability. That why people take the oc off their ram before they begin playing with the cpu.

Also 44c is almost certainly the core temps your reading. Ignore them, they're inaccurate on phenoms (badly placed). Use hw monitor and watch the mobo sensors, TMPIN0/1 usually.

Oh, and I found overdrives stability test caused my cpu temp to spike higher than linx, so don't dismiss it. That and the fact that it tests multiple elements simultaneously.

Tazzfalcon · 12 Apr 2011 at 13:46

I will do as you say. (My plans did involve some staggering and stability testing though)

Last night I ran prime95 for an hour and a half (don't like leaving on overnight) and ran a bit of furmark and then 3dmark11 simultaneously w/prime to get some hot air moving through the case and it was perfectly stable (I know this doesn't prove one way or another I'm just stating it is looking good so far). I'm using ProbeII to monitor temps at the moment - core temp didn't go above 45c which is less than I was getting under heavy load at stock with my previous Arctic Cooling Freezer 7.