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955BE overclocking

belial8321

belial8321

belial8321

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Joined
25 Jan 2011
Posts
757
Location
Solihull, Birmingham
Hey guys, just got my 955BE system up and running, anyone know what the limitations of this chip are, it has a higher factory clock speed than my 1055t by 400mhz, but it doesnt seem to be anywhere near as stable over 4ghz, anyone got a 955be that can help me :D
 
The majority of posts I've seen seem to have 4.0 Ghz as a limit, mostly 3.8 Ghz stable. Wouldn't surprise me if someone had managed to get higher though.
 
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I've had 4.1 relatively stable in most things, benchmarks, prime etc - then get wonky playing Fallout3 (+ mods)

It sits at 3.8 all day with no extra voltage/tweaks etc and takes anything with little temp rise so thats what mine is mostly at.
 
Depends on stepping.

Yours new (like mine) is RB-C3.

Will do 4.0GHz on stock volts - I haven't tried pushing it further, but can do in a few weeks when exams are over and I have the time :p
 
My B55 is being strange. I can set it to 20x200 and it'll POST and boot on automatic voltages (1.25ish), but if I try to set the voltages higher manually it won't even POST. I've not run a lot of stability testing with automatic voltages, but I'm assuming that 1.25 is insufficient for 4.0GHz.

But yeah, a 955 should do 3.8-4.0 without issues.
 
4ghz is doable on stock volts but it wont be prime stable unless you have a very very good chip, i run my 955BE daily at 4.2-4.4Ghz with 1.55vcore, prolly not prime stable but stable enough for day to day gaming and benchmarking
 
Seraph said:
4ghz is doable on stock volts but it wont be prime stable unless you have a very very good chip, i run my 955BE daily at 4.2-4.4Ghz with 1.55vcore, prolly not prime stable but stable enough for day to day gaming and benchmarking
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C3 almost certainly will, because there's little/no difference between the 65 these days (or the 75 for that matter), the process is so mature. Heck, my chip bought 6 weeks back does 3.8 @1.35. The VID is 1.4, the default voltage on my gigabyte board is 1.475, heck if it wasn't for heat I'd be pushing quite far past 4, and this is the problem. It's heat that limits the oc on these chips, not voltage any more. A large after market cooler or h50 are probably the most important thing you can do for an oc.

Oh, and it's worth keeping the temps low when oc the cpu, remember the cpu-nb also need voltage increases which adds a bit of heat and it doesn't climb nearly as easily as the cpu core.
 
I think im limited by my £30 board in this tbh :P barely any overvolting options, just generally not much to play with, decent board for £30, but it has really slow bus speeds compared to my main rigs board :o
 
My boards probably around the same budget as yours, which is why my cpu is 3.7. I did my oc on the chip rather than the board.

Oh and if you're running 1600 ram the cpu-nb is bottlenecking it, it should be 3 times the ram speed (although faster is always better) i.e. (800*3)82=2400. Stock is 2ghz.
 
I can run stock speeds on 1.20v (C3 stepping).

4.0GHz is behnching stable at 1.35v, and fully stable @ 1.4v
 
belial8321 said:
Hey guys, just got my 955BE system up and running, anyone know what the limitations of this chip are, it has a higher factory clock speed than my 1055t by 400mhz, but it doesnt seem to be anywhere near as stable over 4ghz, anyone got a 955be that can help me :D
Click to expand...

I've had 4.2 with my H50 and a low room temperature, but I find running it at around 3.8 works best.
 
belial8321 said:
anyone fancy throwing me some numbers to try get a stable 4+ on a low budget board?
Click to expand...

200clk x20 multiplier, 1.45Volts, chances are that will give you fairly slack memory timings, try maybe 228x17.5, should give your ram a little overclock and the timings will be nice and tight :)
 
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