hd3870 512mb max core and memory!

[VortexA1]

thanks for your help btw

 

[Psycho Sonny]

yeah thanks funny enough just as I posted I noticed the gt version.
Well... I'm just planning to get the one hr-03 so I can have it on reverse.
Are there cheaper ones then that you can have in reverse?

no not others that you can put on in reverse but others that are smaller but very effective, the zalmans are very good

this is the slightly weaker option - its cheaper as well
http://www.overclockers.co.uk/showproduct.php?prodid=SY-008-ZA&groupid=701&catid=57&subcat=787

the better option would be
http://www.overclockers.co.uk/showproduct.php?prodid=HS-032-ZA&groupid=701&catid=57&subcat=787

both of these coolers are compatible, only thing you need to worry about with these is if you wanna keep your current ram sinks or the ones supplied, people have had problems trying to keep them on their cards

if you dont have a lot of space between your 2nd card and the case then the hr-03 is your best bet, but their will be no active cooling on your ram then, this may become a problem

 

[Lustral]

Im running @ 820 / 1200 at the moment and it is Crysis stable, im gonna get a Zalman VF900 and mod it up.

Lusty

 

[VortexA1]

ok cheers. Yeah the Zalmans are looking appealing . Well I looked at the hr-03 last night and its 7.5 cm deep with a fan on - too deep to fit in between the cards so no go either back or front .Way to big but very nice!

I think I might go for either of those two Zalmans.

 

[Scougar]

I've got the powercolor PCS version on order that comes with the zalman style fan, so hopefully it will run cooler and quieter than the standard setup

Wierdly, the memory is clocked at 2400 (1200Mhz) as standard but it doesn't have ramsinks. Wondering how much further i'll be able to push it without sinks on the ram.

Anyone else got the 800/2400 PCS (xtreme silent it is otherwise called) powercolor card?

Matthew

 

[silversurfer]

I dont think ddr3 gets that hot and ddr4 is voltage reduced so even less heat?

 

[Scougar]

Yeah it's GDDR4, but noticed the non-zalman 3870's have that L-shape ramsink on them, so pondering how much I might need one of those if I intend to o/c memory?

Matthew

 

[redeye_uk]

I fitted a ThermalTake Duorb cooler to my 3870 yesterday. OC'd my card to 810/1300. Idle temp is now 33 degrees, and load temp is 57 degrees.
Thats compared to the 50 degrees idle, 78 degrees load I was getting with the stock cooler.
Well chuffed

 

[Scougar]

You can get more than that on the core

Was yours the standard cooler, or a special version to start with? Wonder if anyone will sell that simple L-shape ramsink?

Matthew

 

[redeye_uk]

You can get more than that on the core

Was yours the standard cooler, or a special version to start with? Wonder if anyone will sell that simple L-shape ramsink?

Matthew

Yeah, I think the core is locked at 840?..... I'll try bumping it up some more tonight.
Only had a quick OC yesterday, but the display driver kept crashing when i pushed it further; im guessing this is probably down to the memory frequency its got?

Yup, I just had the vanilla cooler from Sapphire, which whilst being quiet, was pretty rubbish at cooling the card.

The good thing about the Duorb was it allowed me to keep the standard ramsinks (L-shaped ones) which are far better than the ones that came with the Duorb.

 

[Scougar]

Yeah it's a nice simple implementation by ATI.

Not that this is an o/c'ing thread, but if you have trouble clocking the core, then drop the memory back to standard speed, and try again I also found with my x1950xt, that once it crashed it wouldn't recover even at very low clocks, it would still artifact. I would have to reboot to get it to work again and retry the overclock. BTW, the multiplier limits the o/c to a maximum of 862Mhz with the standard bios. A modified version (released by ATI actually) is available and allows O/C'ing (at your own risk) to above 1GHZ I would expect you'd be able to get at least to 900Mhz safely depending on if your core if capable of that at stock volts. The 1Ghz at present requires a hard volt mod to be done in order to get 1.4-1.5volts to the core.

Matthew