soap

Kinda. I'm at Shdow Moses and encountered 3 crashes, for about 10h total playtime. It is known to crash however, but not every 10 min. More like every 2 hours. There's no save-states, but you can save at anytime in MGS4 so honestly I never lost more than 5 minutes of progress. Oh and those aren't hard crashes I'm talking about, just the game crashing, not the whole PC freezing or BSOD. It'll most likely be fixed in the next stable release of RPCS3.

is it stable ?

Make sure you meet the minimum requirements, have the custom build of RPCS3 and use a US ISO of MGS4. I don't think having a US one is a requirement, but the PAL version is at 25hz, and people made the custom build for the US version AFAIK.
I never got that error tho, check out the RPCS3 website to check what it means.

It's hanging on my computer. Like a disc error in the upper left on the screen. Do you know how to fix it? Thanks man.

Honestly, since RPCS3 uses Vulkan it's as much dependant on your GPU than your CPU and in your case, I don't think a 760 would cut it. Maybe if you don't mind playing at 720p30 it'll do, dunno. If you do try however, please post your results ;)

i got an old ass gtx 760 but an r7 1700x, you think i can run it? don't wanna waste time for nothing.

R5 1600X @ 4.0Ghz, GTX 1060 6gb overclocked, 16Gb 3400Mhz C14, game's on a Samsung 840 Evo 512Gb SSD. Win 10 Pro.
1080p30 quite constant, although the emulator crashes now and then. I chose to limit to 30 so that the framerate stays consistent, but it can achieve between 60 and 30.

what are ur specs?

Far, far better. You can run it in 4k60fps if your hardware can handle it. PS3 version ran at 30hz for NTSC and 25hz for PAL version, at 720p. It would often drop at or below 20fps.
You'll need a custom version of RPCS3 to run MGS4 atm, check out the description of this video: https://www.youtube.com/watch?v=oW8ue4Uy80s . He provides everything you need, minus the game itself of course.