Duel GTX670?

[hogg.james1]

OK, so I read an article over at gaming blot (link below) about Watchdogs. I've already Pre-ordered the PC version and it came as a surprise when they released the minimum system requirements for the game. My pc meets the minimum requirements, but falls short in the recommended as you need at least a i7-4770k which I have and a GTX780. Whereas in my current rig I've only got a GTX670.

After some looking around online I read somewhere that two 670's in SLI have more power than a 780. And this is also a cheaper option. As a 6780 is about £100 cheaper than a 780.

So I'm thinking that I'll be able to SLI two 670's together and this is where I have some questions. One of which is that I've got a EVGA GeForce GTX 670 4GB Superclocked as my current GPU (link below) and I was wondering will I be able to mix the manufactures of the GPU's, as I was looking at a Galaxy GeForce GTX 670, (link below) which is substantially cheaper than the EVGA version.

This then leads me on to a second Question and that is can I mix the amounts of onboard RAM that is on the GPU's, as my 670 has got 4GB and then the Galaxy 670 that I was looking at also has 4GB of RAM, but I noticed that there are many cheaper 670's with only 2GB of RAM.

And the final question I have is would my computer be able to support two GPU's in SLI without any bottlenecking.
Current Specks are:
Motherboard - ASUS Maximus VI GENE
Processor - Intel Core i7 4770K
Memoy - 16GB (Kingston HyperX Blu [4x 4GB])
Power Supply - EVGA SuperNOVA NEX750G Gold (750W)

Links
Watchdogs Specks
http://gamingbolt.com/watch-dogs-pc-ultra-specs-revealed-intel-core-i7-4th-gen-gtx-780-required

EVGA GTX670
http://eu.evga.com/products/moreInfo.asp?pn=04G-P4-2673-KR&family=GeForce 600 Series Family

Galaxy GTX670
Do not link to competitors.

 

[ShivP]

If you get a 2gb second card, you will only be able to use 2gb VRAM. Get a 4gb, and go for SLI, you might want to upgrade to 1440p one day anyway 4gb VRAM will be great for that.

 

[setter]

Aside from the ram qwery as answered above, the rest of your system and power supply will be fine for sli, games your looking at a total system draw at the wall of 500w Ono.

 

[Twirlywoos]

Overclock your processor and there shouldn't be any bottlenecks. Watchdogs ultra spec requirement asks for a 780 http://www.maximumpc.com/youll_need_burly_pc_run_watch_dogs_ultra_settings_2014

So even though a 670 in sli is more powerful, the game will need more than 2gb VRAM if you want to go Ultra.

Your PSU would be borderline if you wanted to SLI anyway imo.

 

[setter]

Psu will be fine, most i ever seen was 586w running 3dm firestrike, i7 4770k @4.5ghz and 670's @ +80/+600. Less in games. Clocking the cpu will certainly help too.