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Thread Starter 
Hi guys,

I'm about to replace my ATI Mobility Radeon HD 4670 MXM Type A card in my laptop with an NVIDIA one. I was browsing eBay and found some possible candidates but there's something I'm not sure about:

Is MXM-B backward compatible with MXM-A?

According to MXM-B cards are longer than MXM-A cards but let's assume I have enough place in my laptop. Then only pin and electrical compatibility matters. Can an MXM-B card gracefully degrade as an MXM-B card in this case?