oh im not doing it only for lowering the watts bill but also for the sake of benching, now i know that a 7850 would give me better results but the price of the 7700K (with the rebate) + the 240/250 will cost me less than a 7850 actually, mind you i have a 760K+ a GTX 580 and i had a R9 270 before the 580 did cost me 89chf less than the R9 and give better result for FPS ingame but eats more watts, so if i can achieve a playable FPS (with minor tweak on the settings) with a 7700K and some DDR3 2133mhz i am happy for the 240/250 i will take a LP model so if i decide to take a new GPU later on, i can use it for the DC7900 now for staying on the to-pics some pics of the Arima dual 940 board that replaced my Master3-133 FA4R before after still some work to do on it edit: my question was not about the APU's RAM but the vRAM type of the card since eteknix recommend DDR3 type over DDR5 (at last there is some 2gb model in DDR3): "Before you even get started with the Dual Graphics/ Hybrid CrossFire setting up process you first have to select an appropriate graphics card appropriate for your APU. AMD’s recommendations are seen below, however, we’ve chosen to do things slightly different. We paired up the A10-7850K with the Sapphire R7 250 2GB DDR3 graphics card and the A10-7700K with the XFX R7 240 1GB DDR3 passive graphics card, both pictured above. We feel if you’re buying into the A8-7600 you’re unlikely to want to CrossFire discrete graphics as the A8-7600′s main selling point is its low power – adding a discrete graphics card ruins that advantage. All Kaveri APUs will work with any “Oland” based R7 series graphics card meaning in theory you can use the R7 240 (Oland Pro) and R7 250 (Oland XT) with any APU. Note that only Oland GPUs work, the R7 250X is “Cape Verde” and the R7 260(X) are “Bonaire” so will not. You may also be thinking, why DDR3 models? Well this is simple. The APU uses system memory, your system memory is DDR3 and its speed determines the graphics memory speed of your APU graphics. If you use DDR3-2000MHz memory then you should use an R7 240 or R7 240 that also uses DDR3 memory of a similar frequency. Using a GDDR5 card will bring no benefit because both cards have to operate at the same frequencies to work as far as I am aware. Therefore if you have 5GHz GDDR5 you are no better off than with 2GHz DDR3 in Dual Graphics. This obviously means that the faster your system memory is, which is effectively the bottleneck in an APU system, the faster your graphics card can run and the better the overall performance is. However, the caveat to this is that APUs are often budget systems so you’re unlikely to have expensive high speed memory, most people will opt for something in the 1600-2133MHz range as this is where it is most affordable."