Originally Posted by
Hexpresso
What? Your screen is totally ****ing irrelevant. Do you think screens(monitors) have absolutely anything to do with the power of your machine? If so, where did you hear this? Your computer's simply incapable of running at a decent frame-rate. Probably because it's bad, old, or the more realistic situation, in which it's both bad and old. But in no way does having a no screen contribute to frame-rate. At all. Your frame rate would be the exact same.
If anything, the new "screen" you bought has a higher resolution than your GPU is comfortable supporting, thus putting more strain on it than your previous "screen".
Try switching back.