Graphics How much will my CPU bottleneck a Entry/Mid Range GPU?

I currently have an AMD A8-5600K APU based system for casual gaming but I'm looking towards building a cheap gaming system in the near future.

However I wont be able to afford the whole system for a while, so I was thinking of buying the graphics card first and dropping it into my existing system in place of the APU graphics. Then replacing the CPU/Motherboard in a few months.

I realise that this will likely restrict the performance of the the GPU due to the weedy CPU, but I don't really have a clue to what extent.

Are we talking about somewhat reduced frame rates that would still be a big interim increase in performance for me?
Or totally crippled and not worth bothering with?

Currently looking at a Radeon R9 270, or maybe something a bit cheaper.
Thank you for any advice

 

Probably would not bottleneck that Gpu. If you were going for the higher range 290 290x it would.

Also depends on games you play. Any blizzard game won't like you for example.

 

AMD A8-5600K APU compared to the top 10 most common CPUs.

 

Thank you but I already kinda know how well my CPU performs on my own.
It seems more difficult to tell exactly how it's limitations will limit the performance of a given GPU.

I searched 3D Mark's database of results to try to get an idea.
Although I couldn't find an exact match I found similar performing GPUs (7950) with my CPU, and while they did suffer compared to systems with the same GPU but clearly not CPU limited, it didn't look toooo bad. Probably not as bad as I thought it would.

So maybe some games would fare worse than others, but it still would be a fairly capable interim configuration...

 

Well you'll be fine in battlefield 4 at least (mantle)

 

eventually.

 

http://www.anandtech.com/show/6985/choosing-a-gaming-cpu-at-1440p-adding-in-haswell-

Worth a read, most games aren't cpu bound these days so I'd go ahead and get a better gpu