25mans do require a lot more of your graphics card. I somehow doubt it would set you back to 10-15 fps (perhaps on ultraxion as everyone is stacked up there with fancy spell effects) even though I get set back to around 20-30 aswell on a CrossfireX 6950 2gb setup. One thing to try would be to update your Graphics card drivers. Nvidia updates their drivers every so often (the last release is about 2 weeks old now I think), it usually will boost your performance even a little bit. In the end the FPSdrops can also just be poor game design or some kind of addon freaking out in certain situations, it's hard to say.
As for your 60 FPS cap: Go to Options->Graphics, and disable Vertical Sync. All this does is make sure your FPS cannot go above the refresh rate of your monitor (60 Hz in most cases, some gamers get 70-72Hz+ monitors but you have to look for that specific attribute and it usually does not come cheap). Because it can cause screen tearing it's enabled by default, however disabling it does no harm and it can cause your game to run more smoothly. if you note any weird cinematics (top half loading faster/slower) then just re-enable it.
Hope this helps
Try this its what am using to run wow
GeForce 301.24 Driver BETA:
Release Highlights:
This is the first unified driver from the R300 family of drivers (versions 300.00 to 301.99).
GeForce R300 drivers are packed with new industry-leading, GeForce-exclusive features as well as some really nice performance increases in top games.
New in R300 Drivers:
New GPU Support – Adds support for the new GeForce GTX 680, the fastest, most efficient GPU ever built. Explore GeForce GTX 680 and its new SMX architecture on GeForce.com.
Performance Boost – Increases performance for GeForce 400 Series and 500 Series GPUs in several PC games vs. GeForce 296.10 WHQL-certified drivers. Results will vary depending on your GPU and system configuration:
GeForce GTX 570/580:
Up to 23% in Just Cause 2 with SLI
Up to 21% in The Elder Scrolls V: Skyrim
Up to 17% in StarCraft II with SLI
Up to 14% in Far Cry 2 with SLI
Up to 9% in Bulletstorm
Up to 7% in Civilization V
Up to 6% in Deus Ex: Human Revolution with SLI
Up to 6% in Dragon Age 2 with SLI
Up to 5% in Metro 2033 with SLI
Up to 5% in Total War: Shogun 2
GeForce GTX 560/560 Ti:
Up to 20% in The Elder Scrolls V: Skyrim
Up to 15% in Just Cause 2 with SLI
Up to 13% in Far Cry 2 with SLI
Up to 12% in Bulletstorm
Up to 11% in Civilization V
Up to 10% in StarCraft II with SLI
Up to 9% in Batman: Arkham City
Up to 4% in Deus Ex: Human Revolution with SLI
Up to 4% in Dragon Age 2 with SLI
Up to 4% in Metro 2033 with SLI
Up to 4% in Total War: Shogun 2
NVIDIA FXAA Technology – shader-based anti-aliasing technology available from the NVIDIA Control Panel that enables ultra-fast anti-aliasing in hundreds of PC games. FXAA delivers similar quality to 4x multi-sample antialiasing (MSAA) but is up to 60% faster, enabling substantially higher performance in games. FXAA is supported on all GeForce 8-series and later GPUs. Note: This feature is disabled for games that already have built-in support for FXAA. Visit GeForce.com to learn more.
NVIDIA Surround Accessory Display : Enable a fourth ‘Accessory Display’ to check emails, browse the web, or access other applications while in-game. This feature is supported on the GeForce GTX 680. On prior generation GPUs, this feature is supported in NVIDIA Surround mode with a third graphics card.
NVIDIA Adaptive Vertical Sync – dynamically enables vertical sync based on your current frame rates for the smoothest gaming experience. Adaptive VSync is supported on all GeForce 8-series and later GPUs. Visit GeForce.com to learn more.
NVIDIA Frame Rate Target – dynamically adjusts frame rate to a user specified target. Support for this feature is enabled via third party applications via NVAPI. Visit GeForce.com to learn more.
NVIDIA Surround Technology – Adds the following new Surround capabilities. Visit GeForce.com to learn more.
Add in a fourth accessory display to get access to your email, web, or other applications while you game.
Maximize an application to a single physical display when in Surround mode (enabled by default).
Confine the Windows Taskbar to the center display (enabled by default).
Enable bezel peeking – a feature which enables users to temporarily ‘peak’ behind the monitor bezels using a hotkey (Ctrl + Alt + B). This feature is designed to be used in conjunction with bezel corrected resolutions.
Add or remove resolutions from the list of Surround resolutions (only those selected will be available to applications).
Full center display acceleration for single wide display modes (center display must be connected to the master GPU).
NVIDIA SLI Technology – Adds or updates the following SLI profiles:
Alan Wake
Call of Juarez: The Cartel
Counter-Strike: Global Offensive
Deus Ex: Human Revolution - The Missing Link
Left 4 Dead
Orcs Must Die!
Portal 2
Risen 2: Dark Waters
The Darkness II
NVIDIA 3D Vision – Adds or updates the following 3D Vision profiles:
All Zombies Must Die! – rated Fair
Ghosts 'n Goblins Online – rated Good
Oil Rush – rated 3D Vision Ready
Postal III – rated Good
Rayman Origins – rated Good
SevenCore – rated Fair
Stacking – rated Good
Unigine Heaven Benchmark v3.0 – rated 3D Vision Ready
Wargame: European Escalation – rated Good
Warp – rated Good
Wings of Prey – rated Fair
Krater – rated Poor
Other Details
Installs PhysX System Software v9.12.0213.
Installs HD Audio v1.3.12.0.
Supports OpenGL 4.2
Supports DisplayPort 1.2 for GeForce GTX 680.
Supports multiple languages and APIs for GPU computing: CUDA C, CUDA C++, CUDA Fortran, OpenCL, DirectCompute, and Microsoft C++ AMP.
Supports single GPU and NVIDIA SLI technology on DirectX 9, DirectX 10, DirectX 11, and OpenGL, including 3-way SLI, Quad SLI, and SLI support on SLI-certified Intel and AMD motherboards.
