並不是加一張物理卡就一定會比較順，一個考量點在主卡和物理卡的級距差距
過大，另一個考量點為遊戲中需要用到物理卡的運算量多寡，因此在不同遊戲中
會有不同結果，有些會更順，有些可能帶來反效果。像以下這張圖，GTX480單
卡運算物理比GTX480+8600GT還快，8600GT在運算物理時成為遊戲中的主要
瓶頸。以樓主的例子，GTX980+220，級距相當大，220成為瓶頸機率很高，不
如讓980分一些自我效能來跑物理更好...

http://gamegpu.ru/images/stories/Te...emo/fizica_.jpg






另外NVIDIA已將自家特效(特色)整合成了GAMEWORKS，物理特效包含其中，
有興趣可以看看
http://www.anandtech.com/show/8546/...ith-less-effort

GameWorks consists of several items. There's the core SDK (Software Development Kit), along with IDE (Integrated Development Environment) tools for debugging, profiling, and other items a developer might need. Beyond the core SDK, NVIDIA has a Visual FX SDK, a PhysX SDK, and an Optix SDK. The Visual FX SDK offers solutions for complex, realistic effects (e.g. smoke and fire, faces, waves/water, hair, shadows, and turbulence). PhysX is for physics calculations (either CPU or GPU based, depending on the system). Optix is a ray tracing engine and framework, often used to pre-calculate ("bake") lighting in game levels. NVIDIA also provides sample code for graphics and compute, organized by effect and with tutorials.