4850 vs 8800GT 3dmarks & Accelero S1 test

[Rattle]

doesn't the accelero block the area where you would place the xfire bridges?

yes but I clipped one fin to fit the connector thru, it goes in between 2 fins now and slides right between them from outside the cooler and its only the top card.

also for my bottum card while I wait for my second cooler, i ddint like the 85c temps i took a yate loon and glued it with 3 dabs of super glue to the copper HS like so.

BLAM $4 high speed yate loon and 48c idle and 67c load, my accellerro'd top card which doesnt even have a fan mounted on it runs 10c cooler at idle and load.


http://s16.photobucket.com/albums/b6...t=IMG_1000.jpg
http://s16.photobucket.com/albums/b6...t=IMG_0999.jpg
http://s16.photobucket.com/albums/b6...t=IMG_0995.jpg

I have 4 yate loons stacked 2 high blowing on the side of the cards, in a ghetto stacker 830 fashion. I has to come up with my own sinks for the pwm on the cards, I had a combo of old thermalright sinks and some other ones laying around, you can see them in these pics along with the ghetto yate mod lol.

[1Tanker]

I got a gigabyte 4850 card and run some 3dmarks to compare with 8800GT. I have also mounted Accelero S1 cooler and I was amazed by the temperature drop I saw. Basically stock cooler is a total crap and you can't really control fan because it runs only @ 10%. Anyway at full RPM it would be very loud.

I have a HIS 4850 coming. I wonder if you can increase the stock fan-speed with RivaTuner?

[Rattle]

eventually

[Losphoron]

Well, it will do a lot if the mountingholes are the same as on the HD 38** series, you CAN mod the Accelero Extreme 2900 to fit;



http://www.xtremesystems.org/forums/...&postcount=103

Oh mate ...

You read my mind ..Lol
I suppose 3850 pcb = 3870 = 8800GT..3850 and 4850 can be fitted with accelero S1 so if you fitted it with the accelero 2900 results that it can be fitted on 4850..lOL

[古強者死神]

x8/x8 sucks for 4850s in CF. Go for x16/x16 if you can for optimal performance.

Perkam

Proof? x8 should be more than enough for this card. It gets about 15k in 3dmark06 and just the other day I got 10k on a 4x slot in my bosses computer I built, 8x is double that so its well within the limits as far as I am concerned.

[Kingcarcas]

Proof? x8 should be more than enough for this card. It gets about 15k in 3dmark06 and just the other day I got 10k on a 4x slot in my bosses computer I built, 8x is double that so its well within the limits as far as I am concerned.

How did you get your username like that........... Are you from the Matrix?

[Hiredgoon]

Anyone using an Accelero S1 that needs a heatsink to cover the back chips under the copper-pegged heatsink, just hacksaw the original heatsink off and reuse it. It works quite well.

[revogamer]

I got the Asus 4850 and i can change the fan speed with SmartDoctor, the tool that asus provides.

[disruptfam]

how about some gaming benchmarks

[sam0t]

Just got a 4850 and a Accelero S1 rev.2 , is it totally necessary to add heatsink on the voltage regulators? Thought I saw some Asus 4850 which has after market cooler on it without any sinks on voltage regulators.

Btw , good tip on sawing the original heatsinks voltage regulators copper sink off and reusing it. Might aswell do that.

[gurusan]

yes, definitely do NOT leave the VRMs bare without cooling. These need cooling, and good cooling at that.

[sam0t]

Ok, thanks for the info. Frying a brand new 4850 on the first day would not be cool

[1Tanker]

Ok, thanks for the info. Frying a brand new 4850 on the first day would not be cool

Yeah...i'm really unimpressed with ATI's decision...super-duper low fan-speed(by default). I've got the HIS 4850, and when i first power-up, for a split-second, the fan spins up to about 6000rpm's(it whirs..)...then back down to lame-speed.

[T2k]

I have a HIS 4850 coming. I wonder if you can increase the stock fan-speed with RivaTuner?

The ASUS-supplied software works for fan control, at least with its own 4850 card. You might want to give it a try with your card, they could be the same card IMO.

So far IMO the best and cheapest trick is to replace the default thermal garbage with some good AS and raise the fan speed to 50% - together these should bring down the temp to a reasonable level - ~5xC/7xC - yet card remains single-slot and most likely under warranty as well, depending on your skills.

[gurusan]

to use the asus fan control you need to flash your card to an asus bios.

[T2k]

Are you sure?

[gundamit]

yes, definitely do NOT leave the VRMs bare without cooling. These need cooling, and good cooling at that.

Voltage regulation the grey chips on the right side of the pic? Shouldn't active air take care of the them if you mount a 120mm on the Accelero?

EDIT Nevermind, I'm just going to just use the stock heatsink that is attached to the VRM area.

[sam0t]

What are the 8 tiny black components right from the voltage regulators? Guess they need a sink too :/

edit:

Ok got the Accelero installed on 4850, very impressive. Idle 40c and load ~60c, around 35c drop in temp across the board!

I have a small problem though, when I load the GPU say 5 minutes or so the screen goes blank and a red error led lights up on the card. Maybe the voltage regulators are overheating ?

edit2:

The led indeed is for overheating (found on another forum) and since the GPU is running so much cooler, it leaver the voltage regulators. Used 5 copper ram sinks to cool em, but they run scorching hot, gotta do some modding on em.

[yellowBUM]

sam0t, so you covered the 4 grey pieces and 8 smaller black pieces to the right with ram heatsinks?

did this drop the temperature?

http://www.ncix.com/products/index.php?sku=26871&vpn=BMR%2DC1L%28BCC9%29&manufa cture=EnzoTech

would those ram heatsinks in the link above work?

[keiths]

It seems there's enough room to solder four more voltage regulators in parallel to halve the load.

[keiths]

Kiwi, is the S1 you tested with a rev1 or 2?

[Jakalwarrior]

What sort of temps do you guys get with AS5 + 100% fan speed on stock cooler? Ive been dealing with it on my 2900pro, I can deal with it on the 4850 for warranty sake! - Note, its not like I can hear it over the noisy 92mm delta high speed and the 1ft + lakewood metal cage fan blowing through my case lol.

[sam0t]

sam0t, so you covered the 4 grey pieces and 8 smaller black pieces to the right with ram heatsinks?

did this drop the temperature?

http://www.ncix.com/products/index.p...cture=EnzoTech

would those ram heatsinks in the link above work?

I have exactly those ram sinks in the link. I covered the grey pieces with 3 ram sinks as I had tough time getting 4 ram sinks to fit and covered the 8 black pieces with 2 ram sinks.

Also I just noticed that one heatsinks, that is on a ram, is really bent because of one of acceleros heat pipes.

Have to reseat the accelero and try to squeese 4 sinks on the grey capacitators, maybe and a fan too as the voltage regulator sinks run burning hot.

[Hiredgoon]

I have exactly those ram sinks in the link. I covered the grey pieces with 3 ram sinks as I had tough time getting 4 ram sinks to fit and covered the 8 black pieces with 2 ram sinks.

Also I just noticed that one heatsinks, that is on a ram, is really bent because of one of acceleros heat pipes.

Have to reseat the accelero and try to squeese 4 sinks on the grey capacitators, maybe and a fan too as the voltage regulator sinks run burning hot.

Dude, you are a perfect example of someone who needs to hack saw the original copper-pegged heatsink off and use reuse it. It is easy to cut, just peel off the thermal pad and cut the edge just after the fan. Once you get 1/2 way, it will snap off with little force. Replace the thermal pad and screw it back into the original screw holes, and you have a perfectly fitting rear heatsink.

It really does work better then trying to wedge some heatsinks on there.

[sam0t]

I hear you, I was just about to do that actually! Grew really frustrated over the matter

I reseated the ram sinks on the voltage regulators and added a fan on the accelero s1 to cool the voltage regulator heatsinks and got it stable. Btw. It was impossible to put 4 Enzotech 14x14x9mm ram sinks on the 4850 voltage regulators, they just did not fit! I ended up slapping em on the rams and using 3 of the accelero s1 own, slightly longer ram sinks on the grey voltage regulators.

Also one of the Accelero S1 heat pipes comes so near one of the 4850 corner rams, so I had to bend the ram sinks (height 9mm) fins abit to make it fit.

Long story short:

After my rather unpleasent experience I would recomend either using the 4850 original reference coolers voltage regulator piece (as described above) or using heat sinks and a fan to cool down them.

I would like to know my voltage regulators temps as they run extremely hot with passive cooling. On my case I needed a fan to get em stable, but as others suggest, the original voltage regulator copper heatsink should be enough in most cases. Depends much on the case air flow I guess. Some results to the end:

4850 GPU temps:

Accelero S1 rev.2 passive: idle ~40c, load ~70c. Unstable.
Accelero S1 rev.2 + 80mm fan: idle 37c , load 59c. Stable.
Accelero S1 rev.2 + 120mm fan: idle 35c, load 54c. Stable.