help with psu

During games my pc freezes then returns. I have a 64 athlon 3800+ and a 7600 gt pci-e. Does this have enough power.

Rosewill
Model RE501-BLK
SPEC
Type ATX12V v2.03
Maximum Power 500W
Fans 1 x 120mm Blue LED Fan
PFC No
Main Connector 20Pin
Dual +12V No
PCI-E Connectors No
SLI Support No
Modular Cabling Support No
Hold-up Time >10ms at Full Load and nominal input voltage
Efficiency > 70%
Over Voltage Protection +3.3V, +5V, +12V
Input Voltage 115/230 V
Input Frequency Range 50/60 Hz
Input Current 10A/5A
Output +3.3V@28A, +5V@30A, +12V@34A,-5V@0.3A,
-12V@0.8A, +5VSB@2A
MTBF 100k hours at max. load, normal line and 25°C
Approvals cUL, FCC, CSA, CB, CE,
Features
Connectors 1 x Main connector (20Pin)
1 x 12V(P4)
8 x peripheral
2 x SATA
2 x Floppy
Features User-Adjustable Fan Speed Controller, Sleeved Wires

Unless the PSU has gone bad, it should be more than enough. The 7600 (and system combined) only requires like 350 watts and 20 Amps on the +12 rails.

If you can, try to get your hands on a different PSU and GPU to test them. I am not recommending that you get new ones of either. I am suggesting that if you know a person that would be willing, that you barrow their PSU and GPU to test in your system. If you replace the PSU and still have that problem, then it isn't the PSUand may be the 7600. After you switch the PSU try the new graphics card, same thing applies.
Let us know the results.