Does overclocking a CPU (G3258) affect iGPU performance

Hey guys,

My r9 280x recently died on me (a whole different story) and since its warranty is long over I figured I'd just bag it and stow it away for a while.
My first build right now:
CPU: G3258 @4.4GHz /w CM 212 EVO
iGPU: not sure what model the G3258 has. CPU-Z says it has 1024MB of VRAM and clocks run 599MHz
Mobo: Asrock H97 Anniversary
RAM: 8GB of DDR3 @stock
GPU: Used to be ASUS r9 280x
PSU: Some less known FSP 650W

I was really surprised when I tried to play games using just the iGPU (not clocked, runs at stock) and stuff like League of Legends, Call of Duty 1, WoW etc were pretty much just as playable as before and the temps did not really rise either. Haven't tried any more demanding games. So here comes my question: does overclocking the CPU affect the iGPU's lifespan in any way besides just higher temps on the chip? I've read that the iGPU usually doesn't have it's own dedicated VRAM so it just uses the sticks on the mobo.

Also how doable is overclocking the iGPU? Is there a site where I can compare the different iGPUs on CPUs? If I wanted to, for example, build a new PC but I wouldn't be gaming on it for a while yet. Would it be reasonable to buy another G3258 and clock it just the same or should I get an unlocked i5 something and just hope it's got an iGPU at least as good as the G3258's? I also heard rumors that it has the same integrated graphics as some i3s, which should mean the the i5s have even better ones?

I'm sure that if I got an unlocked i5 with decent integrated graphics, I'd be fine for a few months and then later I'd probably get an RX480 Sapphire 8GB, once the prices lower a bit. Would a 400W PSU handle a clocked i5 and an RX480? In that case I'd give my current build to my brother and probably buy him the best GPU that the overclocked G3258 can handle without bottlenecking - up to r9 280 etc (he's probably not gonna play games or use programs that require hyperthreading).

I know there's NVidia Optimus on some laptops where the software basically switches between the iGPU and GPU itself. That doesn't of course mean that it's using 2 cards at the same time for a single application, but I wonder if it's possible, can they share their computing power? Same goes for PCs, if I have a decent iGPU (decent is very subjective but the G3258's integrated graphics works fine for me right now) is it always better to buy at least a lower-end graphics card to help the CPU and take stress off the iGPU? I'm just a bit afraid that if I buy a cheap graphics card then I'll end up wasting much of the iGPU potential. Also is there any way to compare the performance of an iGPU and a dedicated GPU?

Last question: is DDR4 RAM worth buying yet (to future-proof etc) as they have quite high latencies and you can get a faster DDR3 cheaper?

Thanks in advance!
3 answers Last reply Best Answer
More about overclocking cpu g3258 affect igpu performance
  1. tldr: just get another discrete graphics card. glhf
  2. bboiprfsr said:
    tldr: just get another discrete graphics card. glhf

    There's more than one question so answer them all or answer just one, it'd be real helpful either way.
  3. Best answer
    There is interesting write-up here that may answer some of your questions:
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