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Author Topic: Why is ATI so much better than Nvidia?  (Read 5531 times)
Nox|xoN
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June 25, 2011, 01:33:47 AM
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I was wondering why is ATI so much better than Nvidia? I mean whats so different? Anything in the architecture?
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ColeFinlay
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June 25, 2011, 01:39:05 AM
 #2

nVidia is focused more on floating point calculations and ATI is better for integer calculations.

Hashing requires lots of integer calculations.
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June 25, 2011, 01:40:17 AM
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odd isn't it.

nvidia is 10x better for gaming. Power hungry - better drivers

ati = float math
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June 25, 2011, 02:01:09 AM
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I was wondering why is ATI so much better than Nvidia? I mean whats so different? Anything in the architecture?
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June 25, 2011, 02:02:44 AM
 #5

anyone know when the 7000s series are coming out?

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June 25, 2011, 05:14:33 AM
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anyone know when the 7000s series are coming out?

reference cards should be out Q1/Q2 2012

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goxed
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June 25, 2011, 06:06:12 AM
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Lets take a look inside the GTX 460 which has eight shader modules.

Each shader module has 48 cuda core. One cuda core can do one integer and one float operation using its ALU.
Thus the GF104 / GTX160 card has 8 * 48 = 384 ALUs for integer operation.


Lets see whats inside the ATI Cypress Radeon 5870 which has 20 SIMD engines.
Each SIMD engine (one red row in the picture above) contains 16 thread processor.

Each thread processor contains 4 ALUs + 1 special purpose ALU for transcendental (sine, cosine, etc). Thus one thread processor can can do four integer operations using 4 ALUs.
Thus the Radeon 5870 has 20 * 16 * 5 = 1600 ALUs,  out of which 1280 ALUs can be used for integer ops.

Now the nvidia ALUs run at twice the clock speed i.e. for a 700MHz device they will run at 1400MHz, while the ATI ALUs run at advertised clock speed.
But the ATI ALUs can do shift and rotate in one clock cycle, while the nvidia ALUs can do these operation in (4 clock cycles?  pls correct me if I'm wrong)

So the maximum overall speedup with an ATI GPU (assuming same clock speeds) will be 1280/ (384 *2 / 4) = 6.6X.

We see around 70MH/s with a GTX 460 while we see 400MH/s with a 5870. The ratio = 5.7X.


Looking to review Bitcoin / Crypto mining Hardware.
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June 25, 2011, 06:33:47 AM
 #8

 Shocked
I have to get one of the 5000 series....
nofear1999
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June 25, 2011, 06:37:31 AM
 #9

ATI has more cores than nvidia which makes GPU mining much faster.

Just like AMD are better CPU miners than Intel.
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June 25, 2011, 06:55:57 AM
 #10

ATI has more cores than nvidia which makes GPU mining much faster.

Just like AMD are better CPU miners than Intel.

Yes true, but IMHO a Radeon core != Geforce core especially when it comes to executing SHA 256 operations.

Looking to review Bitcoin / Crypto mining Hardware.
Gabi
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June 25, 2011, 08:58:13 AM
 #11

odd isn't it.

nvidia is 10x better for gaming. Power hungry - better drivers

ati = float math

I must dissent, i have a ATI 6950 and i bought it for gaming and it is perfect for that.
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June 25, 2011, 09:34:09 AM
 #12

ATI = many, not too powerful stream processors

NVIDIA = less, but more complex stream processors

Calculations needed for bitcoin mining = computation of SHA256 = very easy task = performed well on a single ATI stream processor, while a NVIDIA processor is a waste of computational power

bitcoin address: 18FBX6EfJBmqfN2EG8xoEARu5L3TscF4xd
swop
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June 25, 2011, 10:34:25 AM
 #13

They are good at different games. Often AMD is a little more bang for the buck (not very much though). Maybe Nvidia drivers are a little better. Nvidia has better drivers/support in Linux.
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June 25, 2011, 03:01:07 PM
 #14

odd isn't it.

nvidia is 10x better for gaming. Power hungry - better drivers

ati = float math

I must dissent, i have a ATI 6950 and i bought it for gaming and it is perfect for that.

Agreed
DJcoins
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June 25, 2011, 03:40:36 PM
 #15

Nvidia makes good polished products.
ATI makes cards with raw performance.
Somehow ATI is winning here for doing less R&D.
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June 25, 2011, 04:33:28 PM
 #16

Nvidia makes good polished products.
ATI makes cards with raw performance.
Somehow ATI is winning here for doing less R&D.
LOL
Lucario
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June 25, 2011, 05:52:21 PM
 #17

That's hilarious xD I'm very glad I stuck with my overclocked 5850 for this... Shame I'm only getting 2btc/week now though, stupid difficulty increases @.@
shata
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June 25, 2011, 05:59:27 PM
 #18

Shocked
I have to get one of the 5000 series....

I got 5870 and 6970, Your better off going 6970 I think.

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Deimos_Anomaly
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June 25, 2011, 06:08:07 PM
 #19

I went 6770 in my Linux-box because of space limitation.
The difficulty increases is slowly killing me  Sad


Edit: Plus 5850 in main rig

I am the lurker from behind the 2nd moon of Mars.
With Bitcoin being the future, I was sent to retrieve it.
MysterioMP
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June 25, 2011, 06:17:13 PM
 #20

Prices are better but ATI drivers suck!
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