Well its a micro tower case, so please check the design of the PSU before you buy. It may not be standard size and shape, so you will have to change case when you decide to upgrade PSU.
On that matter no 300W PSU is no enough to run this what you want. Roughly 600W would be safe bet for it. Minimum recommended for 6870 is 500-550W.
Quote:
- 500 Watt or greater power supply with two 75W 6-pin PCI Express? power connectors recommended (600 Watt and four 6-pin connectors for AMD CrossFireX™ technology in dual mode)
- Certified power supplies are recommended. Refer to AMD Certified Power Supplies for a list of Certified products
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AMD Radeon