On one hand, there’s a high probability that you won’t experience such a significant increase in productivity at 4000, as the improvement from 3200 to 3600 could bring you close to a high watermark. On the other hand, for your i9-13900K setup with 3200 memory, if feasible, consider upgrading both the memory and the motherboard. You can obtain approximate information on 3dmark.com by exploring various configurations with your CPU. Here’s an example of a filter:

https://www.3dmark.com/search?\_ga=2.37494432.1855643264.1700775190-458613491.1700775190#advanced?test=spy P&cpuId=3026&gpuId=1509&gpuCount=0&gpuType=ALL&deviceType=ALL&storageModel=ALL&memoryChannels=2&country=&scoreType=overallScore&hofMode=false&showInvalidResults=false&freeParams=&minGpuCoreClock=&maxGpuCoreClock=&minGpuMemClock=&maxGpuMemClock=&minCpuClock=5700&maxCpuClock=5810

I always recommend purchasing a new CPU for a new PC. These are just assumptions, and there is a small chance that Intel has quietly addressed a security issue in the latest generations, similar to what happened with the 8th and 9th generations, and it could impact performance. Additionally, the new generation has more cache and cores. For me, the 14700K is definitely better.

this information from Intel site ( https://ark.intel.com/content/www/us/en/ark/compare.html?productIds=232153,226259 )

I thinks its always better to buy newer CPU, in this case Core™ i5-1335U.

https://ark.intel.com/content/www/us/en/ark/compare.html?productIds=232153,226259

Recommended Customer Price $469.00 and $340.00.

13th Gen Intel® Core™ i5-1335U is better )