4850 512 Mb and 4870 X2 2 Gb XFire

Hi Guys, I got a bit of a dilemma, I bought a 4870 X2 a few days ago to pair with my 4850, and all has been well for that time. However, today I snooped around in CCC and it tells me my card are not perfectly matched for crossfire but it will still work. I know that this means that the memories are different and so the 2 Gb 4870 X2 will become a 512 Mb X2. So the problem is, will a 4870 X2 2GB alone be better than my current XFire Setup?

Thanks in advance