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i got an old 7870 XT featuring the Tahiti LE chip, this baby is doing the hell of a job on milkyway@home for instance because of the double-precision FP speed

Hi @applepiie. I have a 7 year old Core i7 with 8 cpu's and a Nvidia GTS 450. I'm hoping to get a Radeon R9 380P 4GB that should be light years ahead of what I have at the moment. What do you have and what returns are you seeing?

*edit I run at 100% when I'm not gaming (which is probably 90% of the day 24/7)

I run an i5-7600K at 4.4GHz (4 Cores) and an Nvidia GTX 1060 3Gb. I got both of them for a decent prize and wanted to upgrade my system anyways. I ran them for the past ~20 days constantly at 100% and make now about 13.3 GRC per day, or 75 Mag.

I actually wanted to use my computer otherwise as well, but I don't have the time at the moment, since I am writing my exams about the past year and should really study instead of having fun with my computer 😅

Hehehe... feel you. Who wants to study when there's fun to be had on the computer!?
I think your 75Mag is mostly due to your GPU. Like I said, mine is ancient (7 years old) and only has 1GB of onboard RAM. I suspect system RAM also makes a difference as I see messages that projects are waiting for memory quite often. I think I will boost that too when I get the GPU in October.