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One error seems to be from an old (pre RX480 driver). Did you uninstall (with DDU ?) the 5770 driver before installing the 480.
With the other error, I would check page file/virtual memory size.
I don't have bf4, so can't offer other suggestions (if game related).
install new windows and new drivers
Thanks for your suggestions. I have discovered that the issue was caused by overclocking my CPU.
After removing the overclock the issue went away.
The 5770 card did mind this but appears the RX480 had issues with it.
All running lovely now even though the CPU is a bit slower
I had a similiar issue. All would be fine with the RX 480, but as soon as I started to game, my system would reset in about 2 to 4 minutes making it unplayable. At first I thought it was an overheating issue, but the real culprit was my power supply. I had an OC 700 watt power supply that was starting to go(it was about 4 years old). Whenever the RX 480 would call for more voltage it would kick out.
I bit the bullet and upgraded it to a 850 watt, platinum rated power supply. This resolved the issue. Hopefully this will help as overclocking will call for more power. If you upgrade you should be good to go with the overclock on both CPU and RX480.