Not drivers if the LED's on the card are staying lit, that is a hardware problem. There is actually 4 LED's on the card and this is what they mean,

D601: VDDC_FAULT

D1601: critical temperature fault

D1602: AUX Hot Plug/Unplug Fault (upper connector)

D1603: AUX Hot Plug/Unplug Fault (lower connector)
from here,

4890 red leds 1,0,1,1 please help :'( - techPowerUp! Forums

The thread linked too and a few others found here,

4890 led's - Google Search

all had the same three LED's lit, but it turned out to be a heating problem, a couple of them from mis-fitting heatsinks. One I came across was due to the bios on the motherboard not supporting an upgraded CPU (don't think this one applies here).

One thing that was the same in most of them was that they all had both power connectors on the card.

Assuming it still has the stock heatsink on the card, is the card sitting as straight as it can with no undue pressure on it from the two power connectors (can cause the card to warp over time and the heatsink to not make proper contact)?