grue (OP)
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March 12, 2011, 05:54:24 PM |
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What's the most important factor that determines a card's hashing ability? From what i heard, it's based on the amount of shaders. is that correct? what about core clock?
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Dude65535
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March 12, 2011, 06:01:39 PM |
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shaders, clock speed and chip design are the determining factors
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Cryptoman
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March 12, 2011, 06:06:28 PM |
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On a related note, does anyone know how many integer operations are necessary to compute one hash?
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os008
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March 12, 2011, 06:44:37 PM |
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Interesting question. I made a quick calculation ...
5850 -> 300 MH/s -> 2.5 TFLOPs
2,500,000,000 / 300,000,000 = 8.33 OPs
I'd say 9 OPs. Someone here who has more expertise in this, please provide some feedback.
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2x5850 @ 600[M|K]H/s
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Beremat
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YGOLD is a Defi platform
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March 12, 2011, 06:52:43 PM |
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Interesting question. I made a quick calculation ...
5850 -> 300 MH/s -> 2.5 TFLOPs
2,500,000,000 / 300,000,000 = 8.33 OPs
I'd say 9 OPs. Someone here who has more expertise in this, please provide some feedback.
4850 -> 75MH/s -> 1TFLOP 1,000,000,000 / 75,000,000 = 13.333 It's probably dependent on core architecture as well.
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Meni Rosenfeld
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March 12, 2011, 07:11:22 PM |
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FLOPs are floating point operations per second, so I don't think they're what we're supposed to look at.
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ArtForz
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March 12, 2011, 07:13:47 PM |
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off-by-3-orders-of-magnitude. HD5xxx needs about 4150 integer operations per hash HD4xxx and nvidia 2/4/5xx about 6350 integer operations. for all current architectures integer ops/second = number of shader ALUs * clock. so a 5870 at 1600 ALUs * 850MHz = 1360000M intops/second, / 4150 = ~ 327.7Mh/s 4870: 800 * 750M / 6350 = ~ 94.5 Mh/s GTX580: 512 * 1544M / 6350 = ~ 124.5Mh/s etc... usually published FLOPS numbers are simply intops * 2 (one muladd counts as 2 operations).
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os008
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March 12, 2011, 07:29:54 PM |
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HD5xxx needs about 4150 integer operations per hash Thank you for the explanation. usually published FLOPS numbers are simply intops * 2 (one muladd counts as 2 operations). Wouldn't that mean ATi is much superior to nVidia in FLOPs; contrary to the reality? Don't you mean FLOPs = INTOPs / 2 ?
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2x5850 @ 600[M|K]H/s
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Garrett Burgwardt
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March 12, 2011, 07:38:04 PM |
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FLOPS are completely irrelevant, since the hashing algorithm uses fixed point calculations.
You could not be more wrong by looking at the FLOPS rating of a card.
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os008
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March 12, 2011, 08:14:36 PM |
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There is still a correlation between FLOPS and Integer operations. That's what i would like to know; what's the equation to convert between them?
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2x5850 @ 600[M|K]H/s
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ArtForz
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March 12, 2011, 08:27:49 PM |
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published FLOPS for GTX580: 1581.1G 512 ALUs * 1544 MHz shader clock * 2 (muladd factor) = 1581.056G published FLOPS for HD5970: 4640G 3200 ALUs * 725MHz * 2 (muladd factor) = 4640G
hey, what a coincidence!
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gigabytecoin
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March 12, 2011, 08:57:13 PM |
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FLOPS are completely irrelevant, since the hashing algorithm uses fixed point calculations.
You could not be more wrong by looking at the FLOPS rating of a card.
Ok, so where are the FPOPS ratings?! ![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)
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apofis
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March 12, 2011, 09:11:36 PM |
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grue (OP)
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March 14, 2011, 03:03:10 PM |
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thanks for all the input guys.
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