Hi I'm building a rig with old components i live in Ecuador and Is really expensive to buy technology here. So my MSI k9a2 platinum died and i bought a gigabyte ga-ma790x-ud4p for my AMD Phenom X3 8650 and i need a GPU that doesn't bottleneck with these CPU i apreciate any suggestions
The "AMD Phenom X3 8650" is a pretty weak old processor, having just 3 cores, if I'm not mistaken. This processor will surely bottleneck any decent high-end or mid-tier GPU. be it AMD or NVIDIA, IMO. On what screen resolution are you going to use this system ? Is it for GAMING, or some other office work ?
Though, I suggest you buy/upgrade something better for your rig, if possible ? Anyways, I'm not quite sure which GPU won't bottleneck your current CPU, but If I make a guess then any of the entry level GPUs might work well, though it's kind of hard to make a suggestion. Let me think......
Since the RX470/570 is a decent mid-range GPU can be had cheaper than many much slower GPUs (at least in NA), get one of those if you can.
Getting "a GPU that won't bottleneck the CPU" makes no sense since which component will bottleneck the other varies on a game-by-game, scene-by-scene basis and quality settings. For the best performance, you'd rather have too much spare processing power than come up short, especially when that spare performance costs little to no extra.
Unless you only playing games that were easy to run 10 years ago or very low cpu requirements that cpu is going to be a big issue regardless of gpu choice. That cpu was weak 10 years ago and is well below the minimum requirements for any modern game that needs even medium cpu performance let alone high cpu performance.
It's an incredibly old platform using DDR2 and PCIe 2.0. You will probably have horrible frame drops and stuttering regardless of what card you choose. Your whole system will be the bottleneck on any GPU.
But in saying that it depends on what games you play. My suggestion if you must stay with that platform is an RX470.
Phenom X3 8650 is pretty restricting, I wouldn't recommend anything over a 750 TI without also knowing what you power supply is and if you have also updated your BIOS to the latest revision. That motherboard can run any AM3 chip but it's going to be restricted a bit with the DDR2 RAM and PCI-e 2 X8 GPU slots. What are you potentially wanting to play and what is your budget?
If you are willing to upgrade your platform in the short to mid term ie; 6 months I would recommend buying the best possible graphics card your budget allows, depending on your PSU of course. Then upgrading your Platform. I would even suggest upgrading to a cheap AM4 based system with DDR4 (now quite cheap).
If you aren't intending on overclocking and have a limited budget, wanting simply an updated PC with all round better performance then
the Ryzen 5 2400G with the vega 11 APU ( integrated graphics ) could be a good option if you have modest gaming needs.
1st gen Ryzens are also starting to sell very cheap on the used and new markets.
Ask yourself these important questions as others have stated.
What is your budget?
Are you looking at the best gaming performance or all round performance?
What is your current PSU?
What games do you want to play?
Are you just looking for better performance within the scope of games and applications you use currently?