some of the omega's are great ... some were junk , same for the cats
the 4.12 cats are hard to find .. the 4.12 omega's have the adv to clock the gpu/ram back up to standard or more on a underclocked card.
As example i've got a 9550 Powercolour 256 card in mrs roo's pc .. it has the same gpu as my 9600 pro card but its clocked at 200 mhz 133 stock ...
my 9600pro runs at 400mhz 333 ram stock (it runs like a top even at 1024 tex)
the omega's drivers let me clock the 9550 card up to 400mhz/ 266 with no problems at this setting .
Most video cards are manufatured to the top of the line spec's. they just get declocked to sell as a cheaper surplus model ,,, or they have different ram ect from various manufaturers .. most will clock to the next up in the same line specs.
just some pointers for guys on a budget . or you have some old pc stuff laying around that ya like to tinker with.