4850 vs 8800GT 3dmarks & Accelero S1 test

[Hiredgoon]

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 rams that 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 installed a 80mm fan on the accelero s1 and with it came a stable card and the GPU load temps dropped from ~70c -> 60c on load too. Gotta give a 120mm fan a try

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 rev2. Passive: Idle ~40c, load ~70c. Unstable.

Accelero S1 rev.2 and a 80mm fan: Idle 37c , Load 59c. Stable.

I got mine setup with no fan's attached, just decent airflow in the case. My temps are 35c/58c using the hacked off heatsink.

[sam0t]

My Antac Solo case air flow is plain bad it seem. Gotta do something about that, and also get another 120mm fan for the accelero, seems like people are getting crazy OC out of 4850 with Accelero S1 and 2 x 120mm fans.

[msgclb]

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.

Test system:
ATI HD4850 @ 700/1000, driver 8.6 with hotfix
NVidia 8800GT @ 700/1000, 175.16
DFI LP T3R, E8500 @ 4.4Ghz
2x1GB DDR3 7-6-6-18 @ 815Mhz
Zippy 700W PSU, cut down XP SP2


Results, I cant overclock 4850 more than 700 at the moment because there is no tool that supports it except CCC
...

HD4850 has a standard hole spacing, same as 8800gt and other so Accelero S1 fits just fine

Have you thought about testing the HD 4850 with the Accelero S1 passive?

Is that motherboard the DFI LANParty UT X48-T3R? If it is then it does have 2-way CrossFire at x16/x16 bandwidth.

Unless it's an optical illusion then it looks like installing a CrossFire setup with fans on the Accelero S1 wouldn't work. What do you think?

[zbomb5610]

Just installed my accelero s1 rev 1 w/ 2 120mm fans and ramsinks over the 20 chips on my 4850, temps are 32 idle.

[kiwi]

Have you thought about testing the HD 4850 with the Accelero S1 passive?

Is that motherboard the DFI LANParty UT X48-T3R? If it is then it does have 2-way CrossFire at x16/x16 bandwidth.

Unless it's an optical illusion then it looks like installing a CrossFire setup with fans on the Accelero S1 wouldn't work. What do you think?

No, 120mm fan is silent in my case and cools VRMs, mosfets, video memory and the rest of the card Yes, it is DFI and yes spacing is not the best

[JamesW]

Kiwi cheers for the review and tests, made for a good read and convinced me the 4850 coupled with a accelero is the biz for my new build, can you confirm if the accelero is the S1 or the S1 rev2 ??

I'm wanting to buy this one if its the correct one?
http://www.ebuyer.com/product/131149

I'll try the standard fittings if not i'll try the hacksaw trick on the original stock VRM heatsink

Regards

[Freaky]

Kiwi cheers for the review and tests, made for a good read and convinced me the 4850 coupled with a accelero is the biz for my new build, can you confirm if the accelero is the S1 or the S1 rev2 ??

I'm wanting to buy this one if its the correct one?
http://www.ebuyer.com/product/131149

I'll try the standard fittings if not i'll try the hacksaw trick on the original stock VRM heatsink

Regards

The one in the link looks like the discontinued Accelero S1 - http://www.arcticcooling.com/disc_prod1.php?type=2. The one you need is the S1 Rev.2 - http://www.arcticcooling.com/vga2.php?idx=147

[zbomb5610]

The one in the link looks like the discontinued Accelero S1 - http://www.arcticcooling.com/disc_prod1.php?type=2. The one you need is the S1 Rev.2 - http://www.arcticcooling.com/vga2.php?idx=147

both versions should work. i have the version 1 and it works perfectly. get load temps of 44 at 750/1100

[JamesW]

Thanks for confirming the linked s1 (version one) will fit, think i'll go for that. Hasn't the new RBE v.1.1 now sorted the stock fan control now though? Some people say they aren't getting those high temps now they can up the fan from stock 10% to 50% ?

[Bhairava]

Hi, i have a question for you kiwi: changing the system cooling on a 4850, is it possible to leave the heatsink on the voltage regulators? Can i separate that heatsink from the rest of stock cooling?
Thx in advance.

[Hiredgoon]

The Accelero S1 version 1 will work fine on the 4850.

The only real problem I have run into is that one of the ram heatsinks is pretty close to a heatpipe and will take some adjusting to make it fit. Nothing serious.

Another problem, is the lack of the back end chip heatsink, but that is solved by previous posts.

[Hiredgoon]

Hi, i have a question for you kiwi: changing the system cooling on a 4850, is it possible to leave the heatsink on the voltage regulators? Can i separate that heatsink from the rest of stock cooling?
Thx in advance.

as stated above in other posts, you can just hacksaw the heatsink off and reuse it.

[Bhairava]

as stated above in other posts, you can just hacksaw the heatsink off and reuse it.

I don't really want to hacksaw the heatsink.....
Other solutions? Can i leave the voltage regulator without heatsink or is it too risky?
Thx.

[AliG]

Accelero seems good enough to me, well worth the money imo, I think I'll get one myself that or I'll step it up to a vf1000 as the stock cooler seems like junk to me (and with the price of a good fan, the accelero will actually end up being around $50)

[drizzt5]

at 700/1110 with the stock cooler fan at 50%, my temps seem pretty good. 47C's idle/65c's load. I'm sure if I put some tx-2 on the core it would be even better, but if I take the stock heatsink off I'm just going to end up putting my accelero on it.... which I plan to do eventually anyways.

Can anyone take a picture of 2x 4850's in xfire with 2 acceleros on them. Mainly take the picture of the crossfire connector. I want to see how it looks. btw, I think if you cut the fan out of the surrounding plastic, maybe you can fit a 120mm on the accelero with both of them on.

Sadly, I just BARLEY fit one accelero into my rig with my water cooling tubes in the way. I might pick up some kind of accelero knock off that is smaller when I decide to crossfire.

[perkam]

Have game results been posted?

Perkam

[drizzt5]

No, but I recently switched from an xfx 8800 gt 512 to a HD asus 4850 and I got similar results in 3dmark06.

Stock4850 :


Biggest OC with CCC possible (actually not, I can reach 700/1110 but i forgot to push apply for this score ):


I noticed both times that I had a higher score with my 8800 gt... I haven't tested it with games yet. Sad that it doesn't do too well in 3dmark06. I gotta do some of these bios/pencil mods soon....

I will do some game benchies I guess when I get home.

Has anyone noticed that games... errr... "look" better with the 4850? I played a little CS:S for fun and I swear! The game looked better !?! And also it seemed like flashbangs didn't last as long.

[tc17]

I noticed both times that I had a higher score with my 8800 gt... I haven't tested it with games yet. Sad that it doesn't do too well in 3dmark06. I gotta do some of these bios/pencil mods soon....

I will do some game benchies I guess when I get home.

Has anyone noticed that games... errr... "look" better with the 4850? I played a little CS:S for fun and I swear! The game looked better !?! And also it seemed like flashbangs didn't last as long.

For whatever reason the 8800gt gets a similar score as the 4850, but in real games the 4850 is much faster. I guess 3dmark really isn't much of a benchmark.