|Both the Intel Augsburg 915G and the Biostar DDR2 Intel G41 MATX Intel Motherboard are standard MATX form factor.|
The Biostar DDR2 Intel G41 MATX Intel Motherboard will fit in the case.
Most full size (e.g. the optical drive is mounted horizontally on the front of a tower case) desktop brand name system models have not used oddball proprietary mboards since the mid 90's, except for some server mboard systems.
There are specified locations where the screw holes must be. A particular mboard doesn't necessarily have all the screw holes as another one, but the screw holes it does have line up with standard mounting post locations in the case.
Make sure when you install a different mboard that there are no metal mounting posts where there is no screw hole in the mboard, otherwise the post may short something on the underside of the mboard.
"And is my 300w powersupply enough for it?"
The PS capacity you need is usually determined by the video card's video chipset that you install in a mboard slot, not what the mboard requires.If you use inboard video or if you use a modest video card video chipset in a slot, you won't need to upgrade the PS.
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.
If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.
If you need to get a PS with more capacity, you can usually replace it with any decent quality standard sized standard ATX PS.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Don't buy an el-cheapo (in quality) PS.
See response 3 in this: