Originally Posted by rluker5
Igpus go to the cpu memory controller and I don't think they take priority. The 5775c has quite a bit more bandwidth than 60GB/s to keep a lesser igpu from getting starved. It also has 2 memory controllers just like a cpu + dgpu setup. Or that Hades Canyon. With a dgpu setup you would also be decoupled from the cpu, ringbus, power delivery, etc and be able to clock better. We should see more when they come out, but I don't think an Intel dgpu will clock ridiculously low. The igpu on my 4980hq does 1450-1500mhz and was released 2 months before Maxwell.
As far as a 512eu Xe sucking down a lot of juice, my main rig has a KW to spare for the gpu. I dare it to be thirsty.
The i7-5775c only supports DDR3 1600. 25.6GB/s. The eDRAM was worth 57GB/s. The Ice Lake RAM is faster than the Broadwell-c eDRAM
. If you get linear scaling with Broadwell-c iGPU overclocking, then you are not bandwidth limited.
The problem is not if it can clock high. The problem is what that will do for power consumption when the design is scaled up to where it needs to be.
You can buy whatever, obviously. People bought the $1,000 GTX 690 after all, and I'm sure that card was a way worse deal than whatever Intel will put out.