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Dumb GDDR5 Question.

post #1 of 7
Thread Starter 
Ok, so I've been seeing the 4870 around and the sellers say 1800MHz, and GPU-Z screen shots are saying 900, but I thought these things were suppose to be 3600MHz. So is GDDR5 still doubling the data rate? or is it x4? Or is the 4870 just running really slow on the memory?

Basically is it?
900x2=1800 effective
1800x2=3600 effective
900x4=3600 effective

I'm so confused on this for some reason.
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post #2 of 7
1800 X 2
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post #3 of 7
GDDR5 unlike DDR2 runs 4 times the speed effectively.
It's rated at 900 otherwise.
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post #4 of 7
Quote:
Originally Posted by Torched-Geek View Post
GDDR5 unlike DDR2 runs 4 times the effective speed.
Are you sure? I thought it was 1800 x 2
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by Joeking78 View Post
Are you sure? I thought it was 1800 x 2
Thats what I was thinking but GPU-Z shots are showing 900, which is what got me confused.
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post #6 of 7
ok. My bad
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post #7 of 7
Quote:
Originally Posted by wiki
GDDR5 has two parallel DQ links that provide doubled I/O throughput compared to GDDR3 and GDDR4.
900x4
    
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