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Ryan220
11-12-2009, 10:26 AM
Last night I Crossfired my 4890s and came to a couple of conclusions about it and thought I’d post them in case anyone else is thinking about Crossfiring

1) Neat case installations and Crossfire just dont work – my case now looks like a hand grenade has gone off inside it.
2) The heat generated is considerable – Ive had to reverse the flow of the side fan so its now an extractor. The upside is I dont need the radiator on in my computer room anymore – seriously.
3) Cost - my pair of 4890s cost me a measly £231 – bargain!
4) The performance boost – Im getting some excellent scores in the benchies (50 to 100% increase (perhaps the additional 4 gig of Ram has helped too?)). Its a bit hard to notice any improvement in gaming as a single 4890 ran almost every game I have at 1920x1080 max eveything, however, it’ll be good for the 2 years until I upgrade my machine.
5) Simplicity – its a breeze to set up. Stick in your extra card connect up the power and the crossfire bridges and away you go. OK, so you’ll end up b*ggering around with sata leads and pcie power leads and perhaps have to move a HDD, but its pretty easy
6) Noise – read the reviews and you’ll believe your computer will sound like Dyson on crack with a pair of these badboys running – not true for me, the noise levels havent perceptibly changed.


The only Crossfire game compatibilty issues I have had are with L4D2 whereby the game stutters when I first join a game or when the map changes after the safe room. This is a known issue and is solved by ALT-Tab ‘ing out of the game and then back in again. The other being dirt 2 – for some reason if I select 60Hz I get major stuttering but at 59Hz its all fine (running 1920x1080, max everything)


If you’re thinking about it then I would suggest go for it. For a budget set up its really very good

Andrew Moore
11-12-2009, 10:34 AM
A nice little write up there from a consumers point of view rather than a review site. Liked it :thumbs:


Andy

Ryan220
11-12-2009, 12:17 PM
A nice little write up there from a consumers point of view rather than a review site. Liked it :thumbs:


Andy

Thankyou.


I would like to take this opportunity to clarify that when I say "measly" when talking about the £231 cost, I mean it only in context with what can be spent on a GPU these days.

I understand that whilst £231 might not be a lot to some people, to others it is a great deal.

I3R0K3N7FEET
11-01-2010, 09:57 AM
photos would be nice ;)


1) Neat case installations and Crossfire just dont work – my case now looks like a hand grenade has gone off inside it.

makes no sense


2) The heat generated is considerable – Ive had to reverse the flow of the side fan so its now an extractor. The upside is I dont need the radiator on in my computer room anymore – seriously.

crossfire/sli will always generate more heat as they restrict air flow and the one at the top will suck heat from the one below.

otherwise its all good :)

the 4890's are great cards and are cooler believe it or not that the 4870's and can clock like the nuts if youre lucky. maybe not with such a large margin such as andy's gtx260 but then again.. ive not seen anyone using a 4890 atomic water cooled edition with voltage bump etc.. :P

snakedoc
11-01-2010, 10:40 AM
These are my benchmark results from a Single 4870 and dual 4870s. I do not have any issues with heat at all. Max they reach is 64c.

http://img41.imageshack.us/img41/2852/dualandsingle.jpg

I3R0K3N7FEET
11-01-2010, 10:45 AM
These are my benchmark results from a Single 4870 and dual 4870s. I do not have any issues with heat at all. Max they reach is 64c.


what versions of the 4870 do you have? in general the rv790 is notably less power hungry at idle (60w) and also cooler< stock vs stock by around 10 degrees. so im sure you must have a well cooled version. as the stock versions can hit over 80. still in a well venitilated case most issues with heat are solved. and tbh imo.. i dont really care how hot they are as long as they are cool..

snakedoc
11-01-2010, 10:48 AM
Gainward (Novatech) and HIS, and the HIS cooler is rubbish. It's having a decent case helps, the Antec 902 is very well cooled.

I3R0K3N7FEET
11-01-2010, 10:52 AM
makes sense.. is the his version the stock version? my his iceq was amazing. it vented the air out the back looked amazing performed well and was quiet. temps never really went over 70.. in fact im kinda gutted in retrospect that i sold it.

snakedoc
11-01-2010, 10:57 AM
I had a version which rear vented, this one (RMAd via OcUK) was replaced with a much lesser model with a cheap HSF just plopped on it. No rear vent or heat pipes, unlike the Nova one, which has heat pipes, no rear vent though.

I3R0K3N7FEET
11-01-2010, 11:05 AM
oh dear.. im guessing it was the stock rear vented one.. they do the job but i think the fans/ size/ orientation/ bearing just dont do them justice.. the reason i replaced the cooler on my 4890 was because the fan developed an annoying noise.

i did intend to crossfiring 4890's but i never really had the money