Topic: The determining factor on MH/s? (Read 3113 times)
thanks for all the input guys.
hey, what a coincidence!
So to finish an integer operation, it needs TWO sub-operations? I would've thought floats were harder.Ok, so where are the FPOPS ratings?! 
http://pastebin.com/AvymGnMJhttp://en.wikipedia.org/wiki/Comparison_of_ATI_Graphics_Processing_Units#PCIe_.28HD_5xxx.29
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.
You could not be more wrong by looking at the FLOPS rating of a card.
Ok, so where are the FPOPS ratings?!
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!
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!
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?
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.
You could not be more wrong by looking at the FLOPS rating of a card.
HD5xxx needs about 4150 integer operations per hash
Thank you for the explanation.Quote
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 ?
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).
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).
FLOPs are floating point operations per second, so I don't think they're what we're supposed to look at.
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 -> 1TFLOP5850 -> 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.
1,000,000,000 / 75,000,000 = 13.333
It's probably dependent on core architecture as well.
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.
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.
On a related note, does anyone know how many integer operations are necessary to compute one hash?
shaders, clock speed and chip design are the determining factors
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?
Jump to: