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You reminded me of my first GC, the same 8400GS (oh yes i entered into high end gaming so late) which i bought for 1750 (oh yeah it was the cheapest among the 8800's era then) and thought i will conquer Earth with the GC.
To be frank I played with that GC for couple of years till BorderLand 1. I grew some knowledge on GC's by then and realized that i need to have a better GC. BTW I sold whole of my 8 year old pc (GC was 2 years old though) then for 10K which wud have evaluated to 12K if bought everything new (if the components were ever available
)
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As you already know now, the GC has rested and its your duty to make it rest in peace (RIP). Also, HD2000 will not pull off BF4 as simple as that.. get a dedicated GC will be my suggestion.