Which 4870 card to buy

[toppel]

I found a good deal on a Diamond HD4870 model # 4870PE51GDI

There is another 4870 made by diamond (model # 4870PE51G) that's a bit more expensive but has more memory bandwidth.

The 4870PE51GDI has 112 GB/sec, but the 4870PE51G has 160 GB/sec.

They both have all the identical and clock speeds on gpu and memory. They both have 1 GB of GDDR5 on board.

Can anyone tell me why the difference in memory bandwidth?

 

[error8]

Memory bandwidth should be tied, in this case, of the GDDR5 frequency. Now, the stock clocked 4870 has 115 GB/sec, which corresponds to 3600mhz. AT 4000mhz (the highest factory oc for these cards) it gives 128 GB/sec. Now, that diamond card should probably have 5 ghz memory clock, to reach160 gb/sec, which is silly. GDDR5 that fast hasn't been invented yet.

You made me curious and I've searched that particular card and got to the same 160 gb/sec. It's on Diamond site too. It must be a mistake and it has "only" 115 gb/sec, the usual norm for 4870.

 

[toppel]

That's excellent information!! I realy apprecaite your reply.

Thank you very much.