2 Way SLI. mixing brand

i was thinking to mix my Leadtek GTX660 (clock are based on reference 660) with Asus GTX660 DCII OC in SLI. so my question is what kind of problem that i might run into when mixing these card. or is it not possible at all?

initially i was thinking to get second exact model but it is no longer available around my local shop (i don't buy my stuff online). but they got tons of Asus GTX660 DCII OC right now. and from their respond when i asked about the card i want i bet they wont make another order of GTX660 unless they can deplete their current stock :p . so any opinion/suggestion/info regarding mixing these gpu are really appreciated. thanks

:)
 


afaik all gtx660 comes with 2gb of vram as standard. i'm not sure if there is 1gb variant like amd always does with their card for cheaper version.

so i think i will go with that asus card. since i'm not going to buy the until next week maybe i will try my luck if i can find another leadtek 660. honestly i already like the fact the the leadtek card was short. cooling performance wasn't bad either if you change the thermal paste.
 
finally got my second GTX660. luckily i was able to found the exact card as my first one. thanks for the helps guys :)

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