FX 3700, FX 3800 is MXM 3 Type B which is different connector. Then I'm not sure if it would fit physically in your machine, as it is MXM 2.1 Type II, where's the GPU is MXM 2.1 Type HE (taller). You have to check that out first. There's also the additional power supply tab on MXM-HE machines, which yours might lack, since it's MXM-II. These aside it should work. Nice upgrade on the 7710!