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Old December 3, 2012, 07:14 PM
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Lightbulb I dont understand the 5970 vs 6990. please clarify

Ok, so i've been researching the hd 5970, and the hd 6970, and 6990. and when i look at overall specs. the 5970 is supposed to be a dual gpu card. so it explains why its more powerful than the hd 6970. but i don't understand why on comparisons, the 6990 is better than the 5970 in terms of its hardware, but the 5970 still performs better than the 6990. but if that's the case, why does everyone recommend the 6990 if the 5970 is cheaper and more powerful? also, if they are both dual gpu cards, why does everyone compare 2 5970's to one 6990? and if the 5970 is faster than both cards, then why did amd downgrade from the 5000 series into the 6000 series? all the conflicts in the information is making my head spin. please clarify all the confusion for me. THANKS :)

i got the information from here in terms of comparisons: Radeon HD 5970 vs Radeon HD 6990 – Performance Comparison Benchmarks @ Hardware Compare
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Old December 3, 2012, 07:29 PM
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Instead of looking at a comparison where the numbers are purely theoretical, try reading the reviews of the actual cards and their recorded performance.

For instance, AMD Radeon HD 6990 4GB Review shows the 6990 is significantly faster than the 5970. Anandtech's bench sums up the review results, allowing you to directly compare two products. This link is for the 5970 vs the 6990 and not surprisingly the 6990 is again better is almost every performance measure.
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Old December 3, 2012, 07:31 PM
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Yeah, that theoretical link is pure BS. If you want a real comparison, use AnandTech:

AnandTech - Bench - GPU12
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Old December 4, 2012, 06:54 AM
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Agree with others. Read real world reviews
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Old December 5, 2012, 07:11 AM
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Quick question off subjet, would i gain performance boost from a tri-fire 5970 + 5870 to a single 7970 ?
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Old December 5, 2012, 07:28 AM
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A brief history of video cards: 64 GPUs tested from the last five years - 3DMark Vantage | Hardware.Info United Kingdom

This isn't a straight answer. Examine the link above. This is comparing a bunch of video cards using 3d Mark. Compare the 5970 (32 342) to the 5870 (22 708) and you get an increase of 70% for the crossfire solution. So, not quite double. The addition of an extra core in the 5970 adds a net difference of 9634 vs the single 5870. So, let's assume that a third core (in this case your 5870) will add to the 5970 by that amount. Calculated score for the 5970+5870 in Tri-fire is 41 976 (this is making a lot of assumptions about linear increases from Crossfire to Trifire, but whatever). Compare the tri-fire score (41 976) to the 7970 score (35 733) and you have a higher score, therefore higher performance.

What these numbers don't tell you, however, is the problems you'll have using a tri-fire setup vs. a single 7970. Not all games support crossfire/trifire, and you'll probably get a LOT more microstutter using the tri-fire vs. the single 7970. Not to mention, the power consumption of three cypress chips running full bore will be a LOT more than triple the power consumption of a single 7970.

Essentially though, it's basically a wash. If you already own the cards, you're happy with your 5970+5870, and you don't mind the occasional driver issue, then I wouldn't bother changing. I would wait until next generation before buying a single high end GPU. On the other hand, if you're noticing a lot of microstutter, and incompatibility with games when using Tri-fire, then yeah, it may make sense to switch to a 7970. If you sell you 5970 and your 5870 on the BST, you'll probably make more than enough to buy a 7970 GHZ edition. Or, even a GTX680 if you wanted to go that way.
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Old December 5, 2012, 07:52 AM
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more ATi for the Tesselation but im trying to play far cry 3 and with DX11, everything at medium and still barely able to push pass 40fps and its laggy as f***, when i had the 5970 alone i could play 30fps everything on ultra hbao 5 frame buffer ....

i guess far cry 3 doesnt support tri-fire, which would be dumb for a brand spanking new DX11 game...
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Old December 5, 2012, 12:25 PM
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Supporting Tri-fire is like a gas station suppying race gas -- there is a demand for it, but it takes a significant investment which for the majority of providers doesn't match the size of the market.
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Old December 5, 2012, 04:17 PM
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well i took out my 5870 and still did the same thing, then i check and the MSAA was at 8x, turn it off and was getting 200fps, threw back all the graphic settings to Ultra and no vsync and now running ~70fps on my 5970 only :P so i'll try back my tri-fire later and hope it all works
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Old December 6, 2012, 07:18 PM
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thanks for all the posts. i understand now.. somewhat.. :P
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