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Crossfire 4870 is too slow???

Last response: in Graphics & Displays
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July 23, 2009 7:53:56 AM

Hello

I recently switched over from sli to crossfire but I think my crossfire setup isn't running as fast as it should.

Here is my system:

amd 9950BE (3.6ghz)
gigabyte 790fx mb
4gig firestix 1066 ram
1000w power supply (just bought it today. My last one kept turning off)
2x 4870 512mb

Ok so when I try to benchmark the cards in world in conflict I get 35fps average at 1900x1080 with everything on high and 4x aa. The low goes to 10fps. Online I saw 4850s doing 50fps average with the same settings.

CF is on in ccc. And I hooked up the crossfire bridge.

What's going on? Does anyone know of a good (free) way I can test my cards?

More about : crossfire 4870 slow

a b ) Power supply
July 23, 2009 1:39:04 PM

apples & oranges bro, what kind of CPU was used in the benchmark you were referring to?

also, you mentioned that you setup the crossfire bridge, (singular) it should be bridges (plural) Crossfire needs both bridges to work...

Also, i see you have the 512 MB models for the 4870's, on the benchmark you were talking about, did the 4850's have 512 MB or 1GB?
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July 23, 2009 3:09:53 PM

Thanks for the reply.

This is the benchmark I was looking at: http://benchmarkreviews.com/index.php?option=com_conten...

the test system is as follows:

•Motherboard: Gigabyte GA-X48T-DQ6 (Intel X48 Chipset) with version F4 BIOS
•Processor: Intel E8400 Core 2 Duo 3.0 GHz (Overclocked to 3.6 GHz)
•System Memory: Corsair PC3-14400 DDR3 1800MHz
•Audio: HT Omega Claro Plus+ AD8620BR Op Amp Sound Card
•Disk Drive 1: OCZ SATA-II 32GB 2.5-Inch SSD OCZSSD2-1S32G
•Disk Drive 2: (Paging File) MemoRight GT MR25.2-064S 2.5-Inch 64GB SATA SSD
•Optical Drive: ASUS BC-1205PT SATA Blu-ray Disc Optical Drive
•Enclosure: Lian Li PC-B25B Black Aluminum Mid-Tower ATX Case
•PSU: ePower Technology EP-1200P10 xScale 1200W PSU
•Monitor: SOYO 26-Inch Widescreen LCD Monitor DYLM26E6
•Operating System: Windows XP Professional SP-3 (optimized to 16 processes at idle)

Here is another benchmark that may be more reliable: this shows the 4870 x2. My card acts more like a 4830cf.

http://www.tomshardware.com/reviews/4830-radeon-crossfi...

About the bridge. I've been reading that one will work for crossfire. I got my cards used and they only came with one. Getting another one, in Japan, is going to be a bit difficult.

Also, cf is checked in ccc. Don't know if its related but divx is also jumpy since I got my cards.

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a b ) Power supply
July 23, 2009 4:00:58 PM

hmmm.., maybe the crossfire bridge layout has changed? I always thought that both had to be utilized, anyway, how do the benchmarks compare with just a single card as opposed to both cards in crossfire. If they are the same or very close, then it would seem that crossfire is not working correctly, if it's more than a 10% increase then there may be issues.

I might have an extra bridge for you that i could mail, it might take a while to get there, but it's free, lol, let me know if you need one or if it would be easire just to find one.

Konichiwa!
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July 26, 2009 9:21:12 AM

should of bought 2 4850's
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July 26, 2009 10:05:11 AM

the reason why you're getting such low fps is because your CPU is rubbish, even at 3.6GHz, you need to get a better CPU, try the Phenom II line of processors.
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August 2, 2009 2:52:56 AM

Sorry its been a while. The emails were going to my trash folder.

Anyway. Thank you all for your replies. I fixed what was happening.

I changed the position of my bridge and rearanged my raid setup. I gained a quite a few fps. It's pretty much on par with reviews.

I'm getting about 50-52 average consistantly. From what I've been reading there isnt much difference between the 4850 and 4870 in World in conflict.

Ohh and there was a typo with the processor info. its 2.6 not 3.6 and oc'd to 3.0.
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!