Ram speed.
Ram speed.
The i7-9700K can handle up to 2666 MHz, which is quite high and suitable for demanding tasks.
It actually backs higher performance too. Intel doesn’t make it obvious they support it. A 3200Mhz system works perfectly just fine.
This setup only achieves its limits on a standard non-Z series board. On a Z-series board, performance matches the combined capabilities of RAM, CPU memory controller, and motherboard, which can differ but rarely exceed 2666. Speeds above 2666 aren't assured. DDR 2666 feels slow compared to modern standards. DDR 3200 is reliably achievable. DDR 3600 offers a dependable option. Speeds surpassing 4000 require significant adjustments and are less likely to function smoothly.
The Z series board was launched for the 9th generation CPUs. 3200 usually fits with XMP at 99%, 3600 likely works with XMP (possibly some SA voltage), and 3800+ should support extra SA and DRAM voltages.
You’ll need around 16 units; extra memory won’t speed up your games further.
Some suggest a minimum of 16, but more won’t help much.
Others recommend 32 for better performance.
Most agree 16 is sufficient, and using all four DIMMS won’t hurt long-term upgrades. RAM costs are negligible compared to GPU prices.
A solid 4x8 setup works well, whether single rank or dual rank, though higher speeds may require some adjustments. My experience shows it handles the workload smoothly without major issues.