Inno3D GTS 250 vs XFX GTS 250

I'm not hugely knowledgeable on pc hardware and I am curious about two graphics cards. The Inno3D GTS 250 and the XFX GTS 250.

Heres my dilemma,

Other than the Inno3D card having twice the RAM (1GB compared to 512MB) and a different heatsink I can't tell the difference. Oh and the XFX can run 3 cards in SLI whereas to my knowledge the Inno3D card can only run 2. The price difference is trivial which is why I'm hesitant to decide which to buy, unless it can be explained by the difference in SLI capability in which case I'm going for the Inno3D card. I haven't got the money or the slots to be running 3 cards SLI anyway.

Inno3D GTS 250 1GB DDR3
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# Graphics Clock (MHz)738
# Processor Clock (MHz)1836Mhz
# Memory Clock (MHz)2200Mhz
# Memory Amount 1GB GDDR3


XFX GTS 250 1GB DDR3
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# Graphics Clock (MHz)738
# Processor Clock (MHz)1836Mhz
# Memory Clock (MHz)2200Mhz
# Memory Amount 512MB GDDR3

Specs were retrieved from manufacturer sites:
XFX
Inno3D