This ATX motherboard with a single mPGA478 ZIF Socket supports an Intel Pentium 4 processor up to 3.4GHz with a 2MB L2 cache Extreme Edition or an Intel Celeron processor up to 2.4GHz with a 128KB L2 cache and is Hyper threading enabled. It supports an 800/533/400MHz system bus and up to 4GB of DDR400/333/266 memory with a dual channel memory bus.