I have a Leadtek GF 6600GT here that displays artifacts and ASCII characters right at boot—the card (not mine) was likely shorted due to being loosely seated in the slot, causing multiple contacts to touch.
It wasn’t displaying any image, and the AMS 1117 3.3V regulator was getting very hot—after replacing it, the image appeared, but with the artifacts described.

MATS reported the following:

Tested from 0 MB to 128 MB.
LANE E_BANK0 ERRORS
------------ ----------------
FBA[31: 0] 16865188
FBA[63:32] 623578
FBC[31: 0] 929996
FBC[63:32] 46497

External Bank 0 Failing bits:
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31
A32 A33 A34 A35 A36 A37 A38 A39 A40 A41 A42 A43 A44 A45 A46 A47
A48 A49 A50 A51 A52 A53 A54 A55 A56 A57 A58 A59 A60 A61 A62 A63
C00 C01 C02 C03 C04 C05 C06 C07 C08 C09 C10 C11 C12 C13 C14 C15
C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31
C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47
C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63

Read Error Count: 1463420
Write Error Count: 17001839
Unknown Error Count: 0

Full report is attached.

I don't really understand this; all I know is that the memory is showing read and write errors in all four chips.
So, does that mean the chips need to be replaced, or could something else be causing these errors (power supply, controller, etc.)? What else should or could I measure? I haven't been able to find a schematic anywhere.
Thank you for any advice and help.