OCC has published a review on the ECS A890GXM-A 890GX

Unfortunately, when it came to overclocking there is nothing to report. I tried overclocking on two different BIOS versions and both yielded the same results of a instant system crash when the processor clock or multiplier was raised from the default level the motherboard has it set at. This is the second ECS board that would not overclock my AMD 955BE and it might be due to the high voltage requirement of the CPU, but I have overclocked it on many boards successfully, just not any ECS offerings, as of yet. The 890GX chipset is not fully registered by CPU-Z and is shows up as 785GX/SB750 in the Mainboard page.

ECS A890GXM-A 890GX Review