Anyone running Q9550 E0 O.Ced on GA-P35-DS3L (Rev 1.0)

[RussianSensation]

Hi,

Wondering what overclocking results anyone got with Q9550 E0 on Gigabyte P35-DS3L (Rev 1, 2.0, other)?

At 6x multiplier, my Q6600 needs

FSB +0.1, MCH +0.1 to get to 410 FSB
FSB + 0.2, MCH + 0.2 to get to 425 FSB
FSB + 0.3, MHC + 0.3 to get to 438 FSB

After it just fails to boot. I am thinking the motherboard is the limiting component. I was considering a small upgrade for $45 from Q6600 to Q9550 (after selling the Q6600) but read that FSB termination voltage of 1.4V and above is dangerous for 45nm C2Qs.

So what results did you guys get?

 

[Idontcare]

Awesome thead! I have been wondering the same thing.

Have a DS3L with Q6600 here and assumed until now that 45nm quads were not an option because of their low-multiplier. I haven't taken my FSB over 367MHz, thanks for posting what it took to get yours over 400MHz.

BTW did you do anything to your NB/SB heatsinks on your DS3L to get to those FSB speeds? I lapped mine (no laughing) and put some bolt-thrus on them to tighten them down better than those plastic latches with springs plus AS5, but you can only expect so much out of passively cooled aluminum heatsinks.

 

[cusideabelincoln]

Probably the only reason to do it would be to lower temps and power consumption (although this can vary depending on how far you clock each chip). As for performance, if you get both chips running at the same speed they'll perform close enough such that I'd say you wouldn't notice the difference, although there's no doubt the Q9550 would be faster. The Q9550 has an 8.5 multi and the Q6600 has a 9 multi, right? Not a huge difference really.

 

[RussianSensation]

Originally posted by: Idontcare

BTW did you do anything to your NB/SB heatsinks on your DS3L to get to those FSB speeds? I lapped mine (no laughing) and put some bolt-thrus on them to tighten them down better than those plastic latches with springs plus AS5, but you can only expect so much out of passively cooled aluminum heatsinks.

Right now I am running 378 FSB with no adjustments to MCH/FSB voltages.

I actually replaced the stock P35 DS3L northbridge heatsink with the one from GA-965P-DS3 (rev. 1.3) (i.e., I swamped them when I sold my old C2D / 965 setup).

You can see here it's a bit more heftier than the one that comes with stock P35 DS3L:
http://www.pcstats.com/article...00609/gbt965pds3_d.jpg

I also reapplied Tuniq TX-2 thermal paste after removing the pad material.

My NB is not actively cooled and hovers around 39-40*C under EasyTune.

I searched for people overclocking Q9550s on P35 DS3L and it seems most top out at 412-430 or so FSB. That would put the clockspeed at 3.655ghz. I was hoping to get 475FSB because my board did 500FSB with C2D but looks like that's just a dream on P35 with a 45nm Quad.