I just did some looking and it appears as that board requires a rather large power supply.
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The A8N-SLI is rather picky about what powersupply is used with it, and that’s partly due to the fact it is designed as an ATX 12V v2.0 motherboard, featuring a 24-pin power connecter and dual 12-volt rails coming from the powersupply. Although this recommendation goes for all systems, the A8N-SLI demands you have a good powersupply, the minimum requirement is 400-watts. It doesn’t have to be an ATX 12V v2.0 powersupply per se, nor feature a 24-pin plug, but it needs to be able to supply at least 18-amps of current or 200-watts on the 12-volt rail. Of course there’s a difference between running a single PCIe video card with this motherboard and running two in SLI. Up until two
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