http://www.pcadvisor.co.uk/reviews/pc-components/3533832/asus-radeon-r7-250-1gb-review/
"...but there are versions of the 250 restricted to GDDR3, and you should avoid those."
(They probably mean "DDR3" not "GDDR3" but that answers your question. Either way, I'd recommend a 2GB video card with a bit more processing power for any type of gaming.)
*For 32-bit Windows you should get a 1GB video card as it can only address 4GB in total which includes system and video memory and minor other things. For example, a 2GB video card might limit you to about 1.8GB of System memory if you have 2GB or more installed whereas a 1GB card would allow about 2.8GB if you have at least that much installed. Below 1GB of VRAM and you'd have far too many...