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Q6600 - Vcore drop on load?

GregI

GregI

GregI

Associate
Joined
10 Dec 2007
Posts
1,869
Hey guys, ive only really had this chip for a few weeks and really had no problems(only when ocing with low v core etc)

Anyway, to keep it stable at 3ghz i stuck in a 1.3550 v core into my asus bios(p5k-e) and has been folding for hours and never missed a beat.

However, i thought when your cpu was on load the vcore went up?

I don't understand these pics i took. A lower v core on load?

Idle -

chip1.jpg


Load -

chip2.jpg
 
Wouldn't quite say that, say you put in 1.35V in the BIOS you'll typically actually get slightly less say 1.3V (Vdrop) and then if you increase the load on the CPU the Vcore will drop even further, anything upto a 0.1V depending on your motherboard. Some BIOSes let you effectively disable Vdroop though using a feature that Asus call Loadline Callibration.
 
vdroop has got you there man.

it varies from board to board. my p35-ds3r with the q6600 had a fair bit of vdroop but the p35t-dq6 i have in the media pc now with the q6600 has hardly any vdroop at all, although vdrop is still there unless i enable the load line calibration in bios.
 
no_1_dave said:
Why does it exist?
What point does it serve?
Click to expand...

Basically your cpu has a factory set upper maximum voltage or VID. The vdrop is a negative voltage offset from the VID, this is the actual Vcore (Vcc). When there is a change in load the current changes and Vcc will follow, but overshoots the set Vcore. This overshoot stops at or below the VID. You can see you cpu's maximum VID from applications like Coretemp. The Vdrop and Vdroop for that matter are there to stop you overvolting (spike) your cpu.
 
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The P5K boards have a setting to offset the vdroop, making it smaller :D

It still appears as one notch for me, so i'm 1.45v in BIOS, but 1.43v in windows (assuming from what i've read, that means BIOS is telling me one thing, but is actually setting it lower as a safety buffer). Got 1.325v VID, so ain't bad.

Anyone wanna buy a Q6600 G0 lapped? :D. I'd sell it dirt cheap because i'm a plonker heh.
 
Hehe. It's like 3 weeks old, lapped using only 1200 grit, though not all the way down to the copper.

VID 1.325v (Thats high but not the highest, seen a poor bloke have 1.36v i think which is highest)


With zalman 9700 air cooling and using the supplied thermal grease (STG-1), will do 3.4Ghz @ 1.45v. Temps are 33C idle in cool case, 69-70C under prime95 small FFT's.

I'd flog it if i got a decent offer to be honest, kinda want a dual core, i simply have no use for quad core for the forseable future, even with video encoding and no, Crysis doesn't make use of it :)

Oops, sorry, iv'e turned this into Ebay!
 
UT3 i heard was a bit pants though. But yeh actually, there's a new MMO coming out using UT3 engine.

Regardless of whether it uses 4 cores is kinda irrelevant though, modern games barely use the CPU at all, Crysis uses less than bloody Internet Explorer, it's all about the graphics card and not much else. Long term though, i.e. next year, yes, will come into it's own.
 
But it's not really FPS games that make use of it yet. RTS games have a bigger need for them at the moment.

I play a lot of Supreme Commander: Forged Alliance and that games makes use of Dual and Quad cores, it's noticably smoother on Quad's though, especially on dual screens.
 
Was tempted by World in Conflict, but RTS's seem too much like hard work these days and i have enough of that at work, ok i lie, but i goto work still :). But yeh guess you're right, reviews say they can make a CPU crawl on v. high settings.
 
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