GeForce GTX 780 6GB vs GeForce GTX 780 3GB

[Wail1982]

Hello My Friends
I want to ask about difference between EVGA GeForce GTX 780 6GB SC w/ EVGA ACX Cooler and EVGA GeForce GTX 780 3GB Dual Classified w/ EVGA ACX Cooler
I have noticed the GTX 780 3GB Dual Classified is better in Base Clock,Boost Clock ,Texture Fill Rate and overclocking but in memory the GTX 780 6GB SC is better.

Is that mean the GTX 780 6GB SC is better because it has memory size more than GTX 780 3GB Dual Classified
And
When I could choose EVGA GeForce GTX 780 3GB Dual Classified w/ EVGA ACX Cooler or EVGA GeForce GTX 780 6GB SC w/ EVGA ACX Cooler

My best regard

 

[VincentP]

Up to 1440p resolutions, the 6GB memory won't make a difference so choose the faster card.
If running 4K resolution, choose the 6GB card.

 

[Plusthinking Iq]

most games use only 1gb vram, only aa and ress above 1080p will push it up to 2gb.

 

[photonboy]

The ONLY scenario that 6GB remotely makes sense is a Triple-Monitor setup of high-res monitors and then you'd need a SECOND card as well.

There's maybe a couple games that use more than 2GB with a single monitor of 2560x1440 or below.

*As for 4K, it would make far more sense to stick with 2560x1440 (even if the monitor is 4K) which looks essentially IDENTICAL and gets about double the frame rate. Put another way, even with a SECOND, expensive card you can't achieve 2x the frame rate in SLI so you'd still get lower performance at 4K than 2560x1440 for an imperceptible quality difference.

**The BEST monitor for gaming is the upcoming G-Sync monitor from Asus (2560x1440, 120Hz, lightboost).

 

[VincentP]

most games use only 1gb vram, only aa and ress above 1080p will push it up to 2gb.

Skyrim with the official high resolution textures and 8xMSAA exceeds 1GB of VRAM at 1920x1080:
http://www.tomshardware.com/reviews/graphics-card-myths,3694-5.html
Mods to improve the textures and other graphical elements of the game can push it over 2GB, but reducing MSAA is enough to bring it back under 2GB.
At 2560x1440 resolution I have had to disable MSAA to run with these mods and avoid stuttering due to excess video RAM usage on my GTX 770 2GB.

3GB of video memory would alleviate this, hence perfect for 2560x1440 resolution. That is why I suggested the faster card for this resolution (EVGA GeForce GTX 780 3GB Dual Classified w/ EVGA ACX Cooler).

As photonboy rightly points out, the performance drop of running 4K resolutions means the 6GB card couldn't run them at a decent frame rate anyway. A triple monitor 1920x1080 setup would be almost as bad. The 6GB card could be useful for these resolutions but two cards in SLI would be required to achieve playable frame rates.

The Asus ROG PG278Q monitor recommended by photonboy has benefits and drawbacks. The benefit is a 2560x1440 monitor with a 120 Hz refresh rate and fast response time to match. This refresh rate though is somewhat offset by the fact that the GTX 780 is going to barely manage 60 FPS at 2560x1440.
One drawback is having a single display port input with no DVI, HDMI or VGA inputs. If it just a gaming monitor that is fine but you can't plug your laptop in on another input if that is what you wanted to do.
The second drawback is a TN panel that while claimed as very high quality is unlikely to match IPS panels for image quality. If you play very fast paced games this may be the monitor for you. If on the other hand colour reproduction and general image quality are more important to you for slower paced games or anything other than games, there are better options.
The Asus PB278Q is a 2560x1440 IPS panel with very good image quality.
The Dell U2713HM is a 2560x1440 IPS panel with even better image quality both out of the box and calibrated.