Upgrading some of my hardware. What is your opinion?

hey! my current specs are;

• i5 4460 with stock cooler
• MSI R9 380 4GB
• MSI H81M PRO-VD
• 2 X 8 1600 MHZ RAM
• ZALMAN ZM600-LE 600W PSU
• SAMSUNG EVO 860 250GB SSD
• ZALMAN R1 CASE
• 1080P Monitor

I generally do stand still farming in open world (WoW) . When i log with my 6 toons , ram usage hits 16GB then its decreasing to 13 GB slowly. VRAM usage is 2GB constant. 4 cpu cores are at %100 usage constant. Temperatures are around 63 Celcius for CPU , 65 Celcius for GPU constant . So this build gives me 40 FPS on master slot and between 15-20fps on slaves. ( 1080P monitor, Graphics are at 1, resolution scale is at %33 )

So im thinking upgrade to DDR4. I'm able to buy new CPU, motherboard and RAM atm and im gonna use rest of my old build untill mid-summer. If i buy

• MSI Z390 MEG ACE
• i7 9700K
• 16GB + 8 GB 3200 MHZ RAM
• Corsair Hydro Series H100i v2 240mm

Am i able to run 10 toons at graphics on the lowest? Do u think that r9 380 can handle ? My current PSU is 600W and it has done its job well till today but it doesnt have +80 certificate . It will be enough for new specs? Overclock is a must or stock speeds will be enough? (never done overclock so far. really have no idea. There is an overclock button on MEG ACE motherboard i guess, thats why i choose it). 24 GB ram will be enough for open world contents? What do u think about H100i cooler? I generally play for hours and cooling will be serious i think. Please share your opinions.

Do you use a slot-swap macro? Does it include limiting background FPS to 12 and setting slave renderscale to like 0.6? That'd definitely extend your capabilities a lot over not using those. Beeq runs 16 clients on an i7 6700k with some aggressive renderscale/fps settings, so I suspect a 9700k would do 10 without breaking a sweat.