Performance decrease from 3 monitors

[Maztzer]

Okay so I have 2 Dell U2312HM's in a dual monitor setup, i only game on one. I would like to hook my old monitor, a Dell something (1280 720), up to my pc aswell, route a long cable to a bed table and put it on there so I can watch movies on it when Im laying in bed.

Will this decrease pc performance? Like will it use up Vram?

Specs: 3570k @4.5Ghz, 16GB RAM@1600Mhz, 2 x gtx 670 (oc) in SLI

Thanks in advance.

[Thunderjolt]

It shouldn't really. You would only see a performance decrease if you tried playing a game on all three monitors.

[Godlygamer23]

It will not reduce FPS by that much.

[brownninja97]

You should be fine. I lose like 2,3 fps when i use my second monitor. Sadly my brother has taken it.

[grayperview]

I would turn them off while gaming, I notice when i have my monitor and TV on at the same time and i run a game on just one of them, there is a decrease in performance and an increase in stuttering.

[Flamewalker]

Won't be that much fps loss (5-10 fps), vram usage wise i think its +100 mb (vs single monitor) if you got aero running still while gaming, if you disable aero while gaming then it's neglectable (20 mb)

[Oshino Shinobu]

I often have a video or two running on my other monitors while using the middle one for gaming and I don't see any drop in performance. That's with a single GTX 670 and a 3770k, so you'll be fine.