Quote:
Originally Posted by Brutuz
Maybe they were at 560, but AMD thought "Why not 640, everyone's saying that..."
lol, probably not, but still, maybe a really early beta style thing?
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Nvm, I found the explanation.
4830 was 640SP all along (Fud's unreliable on AMD/ATI news).
The 560SP BIOS actually made a 800SP 4850 become a 640SP "4830" (software disabling).
However for the real 4830 chips ATI cut 160 SPs directly (laser or voltage), and used the same BIOS (which should have cut another 160 SPs) again. This time however it went down to 560 (which is weird anyway). Probably some overlap.
[bitTech] Confirmed: Some ATI Radeon HD 4830s are gimped
10-27-08
