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3870 @ 1.2Ghz, 1.75 volts

For anyone who would easilly be able to do that I rekon that would give an overclocked Ultra a run or maybe demolish an ultra, damn the forum is down so cant see benchys.

But no air or water cooling would be good enough would it not?

1.2Ghz, I rekon that could run windows better than my celeron 1.2 :p
 
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lol Will at the windows comment :)

Think he said he reached 1100Mhz before he really needed to replace the over voltage stuff (Which is good news for us I suppose).

1Ghz has been reached on air as it is, so 1.1 may be possible with Water cooling (maybe). Not sure what voltage would be needed for 1.1 though.

Matthew
 
pfft..I already hit 1.012ghz on a 3850 with just your average water setup about a week ago.

It was at a similar insane voltage though...i wouldn't run anything above 1.55-1.6 24/7 on a 55nm chip
 
I would think so, if not then very, very close.

1) The cores are the same
2) The only other difference is the GDDR4 memory, which has very loose timings and doesn't overclock much more than the GDDR3 (all the 3850 cards with samsung chips run @ 1100mhz no problem)....so memory performance is about the same I would think.
 
17085isa2.jpg
 
gurusan said:
pfft..I already hit 1.012ghz on a 3850 with just your average water setup about a week ago.

It was at a similar insane voltage though...i wouldn't run anything above 1.55-1.6 24/7 on a 55nm chip
Click to expand...


EDIT: Oh... he's gone higher now 17k :D cool. Shame that's mostly frome the cpu though :(

Similarly insane? I would say your more mad than Shamino as you managed to crank it to 1.84V if I remember correctly you flippin crazy fool! :eek: :cool: I take it you used an eraser very quickly on that pencil mod?

Would love to give water cooling a go, just finances really (although I have a massive (full tower sized and about 250mm wide) copper/alu radiator sitting hear unused.

My current -within reason - ideal would be 2 3870's crossfired both water cooled, running at 900-1000Mhz and water cooled C2D. Not sure how much that would be but would have to be reliable and quiet. Pump noise would put me right off. How much are 2 gpu card blocks, 1 cpu block, tubing and fluid nowadays?

I think you need to make you standard setting 900Mhz Gurusan :)

Matthew
 
Yeah I'm a crazy fool...but honestly, when's the last time you've heard of someone frying a chip if any sort? Also, I've just moved my radiator next to the window and my GPU idles about 23 degrees and doesn't go over 29c load :p

Anyhow, regarding the 3850 being about the same as a 3870 clock for clock:

I have just done a 3dmark06 run at similar clocks to a 3870 (775mhz/2200mhz core/mem)....

For some reason I get almost 1k less CPU points in Vista...anyhow there are the SM2 and SM3 scores. If someone can post up a stock 3870 run in Vista for comparison that would be great.

run1lq0.jpg
 
Well I'm at 1.45v and I'm not sure how much I should be sending through 55nm on a daily basis.

Also I haven't come across a game it hasn't played very well @ max settings, full AA + AF and 1440x900...

....except for crysis of course...but TBH I'm not really into that game. Just been playing UT3 and Witcher
 
It's a very nice O/C given where you came from that's for sure. Do you have any airflow or addditional fan over the PCB though? I'm not a fan of relying on purely water and not airflow.

Matthew
 
The airflow from the front intake fans is sufficient. I have ramsinks on the GDDR3 modules and they don't get very hot when the card is under load, neither does the funky looking VRM heatsink.

If you've had an overclocked x1900 then in comparison, the components on this card run LOOOAADS cooler.

I have a temperature probe thing but am not sure where to measure.....do i cram it in between the heatsink fins or what?

Anyway from my experience, if you want to run 1ghz daily then I would say you'd have a much better chance of doing it on a 3870 than a 3850. Obviously both can do it, but for me, 1.8v just ain't gonna fly.
 
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