A Google search for your PSU turned up only one reference, in another language, where it may have been an Allied unit. If that's the case, your "Hyena" is overrated junk, and will choke, smoke, and croak when loaded to as little as 80%. The 9800GT may only need around 11A though, so it "may" work. I'm not sure that's a chance I'd take. If your budget permits, get a quality PSU from Antec, Corsair, PC Power & Cooling, Seasonic, or Enermax. At the very least, find one with full range active PFC (no little voltage switch) and 80+ certification. An Earthwatts 380 would be sufficient, but something in the 450W-500W range would give you more headroom and would likely operate in a more efficient part of its range.