I am investing in a new GPU and have decided to go for the ATI Radeon HD 5870 GPU considering it's high hashes/sec rate. However, this card comes in two flavors. 1 GB and 2 GB Graphics Memory (GDDR5). There's a significant price difference between the two of them which made me wonder the advantages offered by 2 GB graphics memory over 1 GB.
I came across this benchmark which attempts to cover this well however from a gaming perspective and all the benchmarks are with respect to FPS.http://benchmarkextreme.com/Articles/Radeon%205870%202GB/P12.html
It concludes that at high image settings, an extra 1 GB of frame buffer provides a lot of advantages.
My question is, from a Mining Rig perspective, what matters the most is the Core Clock Frequency and the Stream Processors. The frame buffer shouldn't be playing much of a role to determine the speed of hashing.
I would like to know, if it's ok to go ahead with ATI Radeon HD 5870 1 GB GPU instead of 2 GB one.