That's not correct.
- GIGABYTE 770TA, 790FXTA, 790XTA, X58A; ASUS P6X58D Premium: Each of NEC D720200F1 and Marvell 88SE9128 [GIGABYTE]/9123 [ASUS] chips uses a PCIe 2.0 5.0GTps x1 lane (in AMD 770, 790FX, 790X, Intel X58 chipset respectively).
- GIGABYTE P55A (all models); ASUS P7P55D-E...