if searching to build for yourself;
any motherboard will state which chipset/processor family it supports.
you would first want to pick a processor and then base the motherboard on that.
then pair memory that is compatible with said motherboard.
you can use this tool to add in available products and it will help with guiding you along the way:
Newegg Custom PC Builder.
using some of those products linked below you should able to complete a very nice build without much hassle.
and any specific products that are out of stock there should be obtainable through other retailers.
the highest performing CPUs for gaming available at the moment are 12th generation Intel.
i5-12600K,
i7-12700K, i9-12900K.
the i9 is way more than any gaming system will need.
the i5 is the best price for performance option.
but if you are looking to spend a bit just for the satisfaction and for future performance the
i7-12700K is a great choice.
the best motherboards for that CPU's LGA1700 chipset are the
Z690 series.
these will offer the most options for add-on devices and overclocking and usually have the best VRM cooling.
but many will only want a B660 or H670 for a cheaper gaming system.
of course DDR5 memory would be the best option performance-wise but they are ridiculously expensive at this time.
for the increase they may offer i don't believe it is worth it.
a good 2x 16GB(32GB) DDR4 3200 or
3600MHz kit with a low CAS Latency is perfect for modern gaming at this time.
power supplies are something you need to be careful choosing.
you will see many +rated models that are not up to the standards they claim.
the wattage you will require will depend mostly on the graphics card that you end up using.
for choosing a good reliable model Tom's still has a pretty nice guide to PSU tiers and which to avoid:
PSU Tier List 4.0 rev. 14.8 (outdated) Last Update: 12-07-2021 Legend : Gray - EoL/obsolete and/or otherwise not recommended for purchase. Green - small form-factor (gold and blue colors are disregarded due to scarcity of SFX PSUs) Gold - best units in the tier (includes requirements for blue...
forums.tomshardware.com
for a GPU and playing games at higher resolutions with higher settings in place you will need a higher-tiered model.
the Nvidia
RTX 3080 Ti or 3090
or the AMD RX 6800 XT or
6900 XT.
they are actually coming back into stock more frequently these days.
but better jump on any you see before they're gone again.
for CPU cooling you would need to decide if you'd rather go with air cooling or liquid cooling.
for air cooling i would recommend the
be quiet! Dark Rock Pro 4
or the
Noctua NH-D15 chromax.
if liquid cooling you would need to decide if going for an AIO(All In One) unit or a custom loop.
for a case, there are so many options available these days it can become hard to find one that you really like and then not be disappointed just after by finding another that's much better.
the best i've dealt with in a couple years now is the
be quiet! Silent Base 802.
it offers a very easy to build in structure, very high quality construction, excellent airflow with dust filters in place, nice modular aspects with the option to be extra quiet using included optional solid panels and built-in sound dampening materials.
links i've included are all very good choices but mostly are just examples to base your own choices on.