What type of motherboard is compatible with the D-300 chassis?

The D-300 chassis is compatible with motherboards sized 12 x 9.6 inches, including ATX and microATX formats.

What are the dimensions of the iStarUSA D-300 chassis?

The dimensions of the iStarUSA D-300 chassis are 19.00 inches wide, 5.25 inches high, and 20.80 inches deep.

No, and good luck finding one. The case is huge, but they can't put a full size ATX in it?

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iStarUSA D-300 Black Aluminum / Steel 3U Rackmount Compact Stylish Chassis - Black Bezel 4 External 5.25" Drive Bays