[strike]While explicitly compatible with the GPU (at least), without knowing total system draw there is no way to determine if anything is throttling due to a lack of power. Give full system specs so that possibility can be evaluated and the potential reason for lag based on other system parts discovered...[/strike] Edit: Irrelevant
Also, what do you mean by "lags." Low FPS, input lag, generation lag, etc?
Edit: Also, I would recommend getting a new monitor... I bought 3 of those wholesale used for $5 each, and that's what they're worth. Incredibly dim, input laggy, and color accuracy is... well, worse than some CRT televisions.