Radeon x800 XL vs Intel HD Graphics 4600

Solution
Wow, that is an old Radeon card you have there. It is slightly inferior to the 4600 Graphics. Plus, it's 256MB VRAM just won't be enough for anything these days.
The intel integrated is actually better as it is slightly faster and supports a whole lot of new tech that helps with playing video, encoding video, and more while using much less power. Oh and good luck finding a driver that will work well with newer OS's with a card that old.
 
Just FYI, but no mention was made of GAMING.

The i5-4460's iGPU is okay for very light gaming. If gaming isn't needed, then there is likely no reason to consider an addon GPU at all. (and as said the Radeon was a step down in every way).

Other:
*Please note the iGPU requires you choose the amount of VRAM to allocate (from your system memory sticks) from the motherboard's BIOS (i.e. "DEL" on bootup etc). For non-gaming, I'd just leave it at 256MB. For gaming I'd put it at 1024MB.
 

It's just an old card I found in my garage that I was considering putting in a computer used from for web browsing mostly.