I'm currently running a Powercolor HD7870 MYST Edition card, overclocked to 1200 / 1600, and it can max pretty much everything at 1080p except Crysis 3, which brings my card to its knees. The MYST is using the Tahiti LE (a cut down 7900 chip) rather than the Pitcairn which is normal for 7800 cards.
In a few weeks I'll be getting both a new GPU and a new display, since my 24" monitor broke, I'm stuck using a 21.5" one, which I find a bit too small. As a result, I'll be stepping up to a 27" monitor, but I'm debating whether or not my card(s) will be able to run a 1440p monitor, or whether I should stick to a 1080p 27".
The new GPU I'm looking at is the ASUS HD7970 DirectCUII TOP Edition card, and this will be crossfired with my current 7870 (the Tahiti LE can crossfire with 7900 cards, but not 7800's.)
Will this be enough power to max games out at 1440p?
If you want to suggest another card that'd be great, my criteria are below.
Purchase Date: 4-6 weeks
Usage: High-end gaming (Crysis 3, Metro Last Light, FC3, PS2, etc. etc.)
Current GPU: PowerColor 7870 MYST Edition
Current PSU: 750W
Monitor Resolution: 1080p / 1440p
Current system specs below.
CPU: Intel i7-3770K @4.5GHz
Motherboard: ASUS Sabertooth Z77
RAM: 16GB (4x4) 1866MHz
Cooling: Thermaltake Water 2.0 Extreme
Case: BitFenix Shinobi XL