Product: ATi Radeon HD4870
Company: AMD
Authour: Alex 'AlexV' Voicu
Editor: Eric 'Ichneumon' Amidon
Date: July 28th, 2008
Crysis DX10

Version used: 1.2 X64

Testing method: FRAPS run through the first part of the Assault level, the results are the average of 6 three minute runs

Settings
Settings

We're controlling anisotropic filtering in-game with the r_TexMaxAnisotropy console command. Be advised that surfaces to which POM is applied won't receive any AF, and since those form the majority, AF won't be very noticeable in-game. AA is controlled through the game's menu.

max quality, no AA or AF enabled
max quality, no AA or AF enabled
max quality, 4X AA + 16X AF
max quality, 4X AA + 16X AF
max quality, 8X AA + 16X AF
max quality, 8X AA + 16X AF

It seems that the extra bandwidth does benefit the 4870 slightly at the only setting that's somewhat relevant, namely the no AA one, as it's faster than the GPU clocks would predict, which implicates that the 4850 couldn't perform to its full potential due to bandwidth constraints.

Why are 4X AA and 8X AA less than relevant? Because you're making a bad situation worse: as we've mentioned on other ocasions, the Very High setting in Crysis is aimed at cards with more than 512MB of VRAM. Large shadow-maps, using multiple-render targets, reasonably high-resolution textures all work towards hefty RAM requirements. Without AA we're skimming the limits of what can fit existing real-estate, with AA, we're going over that. So it becomes a game of how well memory management is handled.

Add the fact that in spite of patches supposedly fixing this, a memory leak still seems to occur when using 8X AA, thus making getting adequate measurements quite a challenge, and you'll see that the AA numbers are there for "hey, check this out" reasons more than anything.

% increase vs 4850
% increase vs 4850

Crossfire Tests

max quality, no AA or AF enabled
max quality, no AA or AF enabled
max quality, 4X AA + 16X AF
max quality, 4X AA + 16X AF
max quality, 8X AA + 16X AF
max quality, 8X AA + 16X AF
4870CF vs 4850CF
4870CF vs 4850CF

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