I agree with the others. I have come from where you are now. I upgradet from a I7 920 OC to 4 GHz and 2x GTX 970 In SLI to a 6 core I7 980X oc to 4.4 GHz on all cores and a GTX 1080 TI. Trust me the upgrade to 6 cores oc to 4 GHz+ is the best thing i dit back then and with 6 core xeons being as cheap they are now, there is really no reason not to do it. Also your old I7 920 can still bring back a little of the money you spend on a Xeon.
Infact if you are bored from being home maybe in these Covid-19 times and maybe want to burn some money. Here is a little project idea, you cut do with your old setup. I al ready dit it and i am so happy with it.
Replace your I7 920 with a 6 core Xeon like Xeon X5650 or better or if you want to play with unlocket multiplier there are Xeon W3680/W3690. Those are rebranded I7 980X/990X basicly and OC the the crap out of them. 6 core Xeons is godt for over 4 GHz all core oc. If you have a really good aircooler like my own Noctua NH-D14 these old chips can be pushed to 4.4 Ghz or better depending on how good a silicone the chip has.
If you only have 6 GB ram, upgrade to 12 GB ram 1600 MHz or better and remember X58 runs triple channel. Just in case. That Means you shut use 3 or 6 stick of memory. Have seen people only running dual channel and by that lose performance.
I dont know if AMD cards runs on X58, but i can say for sure Nvidia 1000 series cards AKA pascal cards like GTX 1070 and 1080 works flawless. I think there never RTX works as well. But i will reccomend to stick with a used GTX 1080 at most. that will be perfect for some 1080P gaming. I use a GTX 1080 TI because i game in 1600P or 4K when possible.
A little fun fact, if interested. You have a Asus motherboard. That means you have the possibility to run a M.2 NVMe SSD as a boot drive in your system to speed up your pc if interested. What to try it out, you will need a Samsung 950 PRO with 256 GB or 512 GB and a M.2 to PCIe X4 adaptor. I have one running in my own X58 setup and it is a blast to have. Even throw i had a SSD to sata before, i have no regrets taken the steps to a NVMe SSD. just remember only Samsung 950 PRO will work out of boks thanks to its legacy mode, no other NVMe ssd have as i know of.
My system as it is now and before.
I7 920
I7 980X setup.