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GTX 770 2gb vs 4gb - Page 3

post #21 of 23
Quote:
Originally Posted by Edwardccm View Post

Quote:
Originally Posted by twitchyzero View Post

4GB on 256-bit bus bandwidth is a waste of money.

But your forgetting something simply measuring bus width is insufficient for calculating memory bandwidth.

(Effective clock) * [(Bus Width) / 8] = Memory Bandwidth

If you wanna get technical, GDDR5 is quad-pumped, so a 256 bit bus can only utilize 1024MB at a time which means you will move stuff in smaller chuncks, .In other words a 256 bit bus can mach or surpass a larger bit bus with slower chips and at stock speeds the GTX 770 has the fastest effective memory clock. But like i mentioned before this would only apply to high resolutions(5760x1080/2560x1440/2560x1600), at 1080p it wouldn't be utilized. You cant just calculate memory bandwidth using a single factor.


Yer calcs are completely wrong. What is this 1MB limitation? Can you explain how it can "only" move 1MB at a time?


Bus width / 8 x DDR Speed x 4 for quad data rate.
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post #22 of 23
http://www.techpowerup.com/reviews/MSI/GTX_770_TF_Gaming/7.html
http://www.techpowerup.com/reviews/Gigabyte/GeForce_GTX_770_WindForce_OC/9.html
post #23 of 23
Quote:
Originally Posted by tsm106 View Post

Yer calcs are completely wrong. What is this 1MB limitation? Can you explain how it can "only" move 1MB at a time?


Bus width / 8 x DDR Speed x 4 for quad data rate.

I don't understand how my calculations are wrong because you have the same formula as myself

[(Bus Width) / 8] x (Effective clock) = Memory Bandwidth because

(256/8) x 7 GHz  = 224 just did the calculations to simplify things

(DDR Speed x 4) = (Effective clock)

1753 MHz X 4 = 7010 MHz = 7 GHz

Same formula as yours

[(Bus Width) / 8] x (DDR Speed x 4) = Memory Bandwidth

(256/8) X (1753 X 4) = 224,384/1000 = 224


The bus can only move data limited to the bus size in this case 256 Bit quad pumped can only move 1024MB at a time where a 384 bit bus would be able to move 1536MB at a time, the limitation I'm talking about is the bus limitation not the memory bandwidth and i didn't say 1 MB i said 1024 MB.

I'm not sure if you wrote to me for the sake of arguing but if you took the time to look at my formula you would have seen that they are one and the same and NOT COMPLETELY WRONG, instead of trying to call me out to tell me i was wrong.
Edited by Edwardccm - 7/25/13 at 2:26pm
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