The 12600k does perform better and has PCIe 5 and DDR5 support. Its less efficient, but still manageable heat load. If both were the same money, I would consider the 12600k better. But they aren't the same price once you factor in platform cost. Not even close.
PCPartPicker Part List
Type|Item|Price
:----|:----|:----
CPU |
AMD Ryzen 5 5600X 3.7 GHz 6-Core Processor | $294.00 @ Newegg
Motherboard |
ASRock B550 Extreme4 ATX AM4 Motherboard | $139.99 @ Newegg
Memory |
Team T-Create Expert 16 GB (2 x 8 GB) DDR4-3600 CL18 Memory | $59.49 @ Amazon
|
Prices include shipping, taxes, rebates, and discounts |
|
Total |
$493.48
| Generated by
PCPartPicker 2021-11-13 13:14 EST-0500 |
vs
PCPartPicker Part List
Type|Item|Price
:----|:----|:----
CPU |
Intel Core i5-12600K 3.7 GHz 10-Core Processor | $299.99 @ B&H
Motherboard |
MSI PRO Z690-A DDR4 ATX LGA1700 Motherboard | $219.99 @ Amazon
Memory |
Team T-Create Expert 16 GB (2 x 8 GB) DDR4-3600 CL18 Memory | $59.49 @ Amazon
|
Prices include shipping, taxes, rebates, and discounts |
|
Total |
$579.47
| Generated by
PCPartPicker 2021-11-13 13:15 EST-0500 |
Paired above is a very good B550 for AMD, and the cheapest possible LGA1700 motherboard for intel. You could save $30 or 40 more by going with something like an Asrock B550 Phantom gaming 4 which would work just as well. You couldn't save any money by getting a cheaper board for Intel.
In this case the 12600k costs a lot more, and thats with DDR4 which shrinks the performance gap some. Also that price isn't factoring in that the 12600k doesn't include a cooler where the 5600x does. However, I wouldn't reccomend using the 5600x on stock cooler, and the cooler cost would be similar for both.
If you want DDR5 to largen the performance gap some, you can get a Z690 UD DDR5 for the same price as the above board, but look at paying $100 extra for the DDR5 tax... and that's IF you can find DDR5 for sale. Its out of stock everywhere.
And the gaming gap isn't that significant either...
As I game and I don't think I would miss the few percent performance extra from the 12600k, and I'd rather have the extra money in my wallet upfront, and the lower power consumption would be a benefit to your wallet a bit too. I think if B series boards come out for LGA1700 for $75+ with a VRM that can tolerate a 12600k, I would totally reconsider. But as it sits, 5600x still wins in my book.