小弟用390和GTX1080去跑2K@VERY HIGH(SMAA), 用GPU-Z監控, 發現兩
者吃的VRAM不一樣, 和底下比較雷同, 390雖然有8GB, 但好像吃到4GB左右
而已, GTX1080則吃到6GB以上, 不過只簡單測試一下, 沒有嚴謹的數據, 照理
說, 若VRAM尚未用罄, 應該把材質丟VRAM中, 而不是主記憶體, 又或者是驅
動對VRAM管理或壓縮機制不同導致, 這點連測試者也無法解釋...

http://www.hardocp.com/article/2016...13#.V8sXaVV95D8

With the AMD Radeon R9 390X we only ever say the dynamic VRAM hit 230MB usage; it was averaging 200MB through every resolution and AA setting. In terms of the dedicated VRAM it strangely did not consume anywhere near what the GTX 980 Ti or TITAN X did. Possibly due to AMD having more advanced texture compression algorithms being taken advantage of? At most we saw it rise up to 4.2GB of usage at 4K. Turning on SSAA did not make it rise hardly at all. We know SSAA was working though, the performance certainly showed it. We really cannot explain the VRAM behavior of the AMD Radeon R9 390X.


有4GB VRAM的卡或許可以開VERY HIGH材質看看(會出現警告), 如果影響效
能不大且沒有微頓應該就OK...