I'm looking at: http://www.coolermaster.co.uk/product.php?product_id=6784 and it says the type is 'Intel ATX 12V V2.3' what does that mean?
Its an indication that this PSU is compatible with the ATX12V V2.3 standard. Newer boards with newer type of components (more fans, SATA Drives, etc..) required that the newer power supplies provide more power. The standard has gone from the old days AT --> ATX --> ATXV12 --> ?
So is it compatible with a uATX mobo?
uATX is just a form factor. You need to look at the motherboard and case. Your motherboard is going to have requirements for power and connectors. Make sure that the PSU you are buying meets the requirements. Then, you have to make sure that the case you are using has space for the power supply.
The case is nzxt Phantom full tower and the motherboard is asus m5a78l-m/usb3 and the psu hopefully will be: OCZ ZS Series 750W 80+ Bronze PSU with 135mm Fan & single +12V Rail
Ok, i'd just recommend looking at the motherboard specs. there should be information regarding what types of power supplies it requires. The case should also have that info. And with that, look at the power supply dimensions and it should all fit nicely.
Ok, thank you :)