My Xbox has a gpu error.. I need help

@lil_dude the official documentation says

0110 E 20==>ERROR_MEMORY_ADDRESSINGMemory address line failed or unresponsive==>Replace GPU or RAM

The unofficial version is that your Xbox is another victim of RROD and it will continue to fail since there really is no fix for it. Remember that the bigger issue with that, is your GPU processor. It is a flip chip design and the issue could be the solder bumps between the IC and the substrate.. It all depends on the individual logic board, and the damage to the solder joints, as well as the chip itself. There is a possibility that a combination of RROD kit and a reflow may temporarily revive your 360. A permanent fix would be a total reball. For a reball to be done, you will need the stencil, a rework machine as well as the proper reball temperature template, and a new processor. If you do not have those tools, you can not do a reball. In that case, you need to find somebody that will do the repair for you. Yes, you do want to replace the thermal paste as well.

Here is a very "quick and dirty" explanation of what causes most of the RROD. It is not always a failure of the solder balls which connect the Flip Chip BGA package to the motherboard. It does happen and you can see why on here More commonly however is that the failure is due to the chip design itself.

As you can see the "bumps" are what actually connect the die to the substrate to make the chip complete. If these bumps fail, the die does no longer make contact with the substrate and thus no contact with the circuit board. The chip has failed.

Here you can see the space where the bump has failed and no longer makes contact. We are talking microns of space here. So, a bit of pressure from an RROD on the top of the die, potentially close the gap. Same with a reflow, it may allow some of material from the bump to reshape and starting to make contact again. The heating of cooling of the chip during use is, what will eventually cause it to fail again.