any suggestions for a compatible graphics card with around the same quality as the other two would be amazing as well.

First of all, there's a significant difference between the Titan X and 970, performance wise and with the cost. But no, you wouldn't be able to upgrade GPU anyway. You have a pre-built system with a poor quality PSU. You'd need to upgrade PSU first, you'd probably have to upgrade case as well, and potentially the motherboard.

Thanks for the quick response. Do you have any recommendations for those replacements.

Not without a budget and currency to work with.

Currency: GBP
Location: London
Budget: 1500GBP (readily available)

(I want a graphics card that can run games like Witcher 3 on Ultra/high settings and one that I wont need to replace any time soon,so might not need to go to budget.)

If you're willing to drop £1500, you might be better off with a whole new system, and just re-use any components that are worth salvaging. Download Speccy and post a screenshot

---

Also, will you overclock CPU/GPU?

[ Register or Signin to view external links. ]

Operating System
Windows 8.1 64-bit
CPU
Intel Core i7 3770 @ 3.40GHz 48 C
Ivy Bridge 22nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 798MHz (11-11-11-28)
Motherboard
LENOVO 65 C
Graphics
SMB2430H (1920x1080@60Hz)
StudioWorks 5 (1024x768@85Hz)
2047MB NVIDIA GeForce GT 640 (Unknown) 43 C
Storage
1863GB Seagate ST2000DM001-9YN164 (SATA) 36 C
Optical Drives
HL-DT-ST DVD-RAM GH82N
Audio
Realtek High Definition Audio

[ Register or Signin to view external links. ]
Could do something like that. 3770 is still a good CPU, so no need to upgrade but new motherboard for SLI support. Might be a pain in the ass to find one in stock since LGA1155 motherboards are much rarer now-a-days. 1440p panel to make use of the SLI 970s, and use your 1080p panel as a secondary. Could get a larger SSD if you wish. You don't need to get the cooler, or you could just get this cooler;
[ Register or Signin to view external links. ]
You could not bother with the 1440p panel and just get one 970 if you want to save money. If you do that, get this PSU instead;
[ Register or Signin to view external links. ]
and any LGA1155 motherboard that you like the look of, it's still best to upgrade mobo though. The ones included with pre-builts are almost always shit, and just a headache.