What Cpu can I use in an Asus A53U-ES21 motherboard

SOURCE: upgrading AMD cpu

There's two versions of the 5200+, one rated at 89 watts, and the other rated at 65 watts. 89 watt version: ADA5200CSBOX or ADA5200IAA6CS, F2 stepping, 1.30V/1.35V 65 watt version: ADO5200CZBOX or ADO5200IAA6CZ, F3 stepping, 1.20V/1.25V Make sure it starts with ADO, not ADA. There's still a lot of the 89W version in the channel, and not many of the new one. NewEgg currently has the F2 (89W) stepping in-stock for $124, and the model you want will likely be priced similarly, when available. They currently have (in-stock) a 5000+ for $120, that is 65W. If you want it ASAP, go with the 5000+ (ADO5000DDBOX). I would recommend getting the retail-box version, which comes with a new heatsink/fan and warranty; this assures you that the heatsink/fan is an appropriate match for the CPU. Note, depending on what RAM you have installed, this may bottleneck the CPU. For full potential, make sure you're running DDR2 PC-5300 (667mhz) memory. You should be able to get a 2GB "dual-channel kit" (matched pair of 1GB sticks) for around $60-70. Definitely run at least 2GB total for Vista; unfortunately, your motherboard cannot go past 2GB. Similarly, you may want to get a new video card (PCI Express x16), but don't bother going all out here.. the system will never realize the full potential. I would target $100-150 for a video card.

SOURCE: BIOS error - CPU is unworkable or has been changed

try to reset cmos by removing CMOS battery from motherboard and reinsert again...

Livewyre Studio

• 49 Answers
• Posted on Oct 12, 2009

SOURCE: Motherboard and cpu upgrade

I had something similar, the only solution that worked was a new OS install....

SOURCE: CPU is not supported

The following link loads the overview of the ASUS M4N78-AM board. To get to the CPU support list, click the "CPU Support List" Tab:

ASUS M4N78-AM CPU Support

Note: BIOS revision 0901 is not correct for Phenom processors. Nor can I find your exact cpu listed.

SOURCE: AMD Phenom-II is installed in Asus M4A78LT-MLE

the only phenom-II cpu's it supports are the 545 and 550 socket am3 1.01ghz. if you have anything other it will not run. here is complete cpu support list here