The Max 11 Apex is hard to find, probably only second-hand and a high price. However, it has two advantages for overclockers over the other Max 11 versions, which may not matter to you:

1. The VRM section has 16 devices in pairs to give 8 true power phases; other Max 11's have 10/5. When overclocking, this means lower VRM temperatures, since the power is divided up more ways.

2. The memory section has only two sockets, but they are connected with shorter, lower-loss paths, and the Apex is spec'd up to 4800 memory instead of 4400.

However, a disadvantage is that, unlike the other Max's, the Apex MB has no M2 sockets. M2 drives require the use of a DIMM_2 module, which mounts two, and has its own socket on, IIRC, all Max 11 boards. Apex 11's came with the module, but they are also on EB.

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Z390: CPU 9900KS; MB Max 11 Apex; GPU Asus RTX2080ti OC11; mem Tridentz 2x8 4266 C19; cooling Optimus V2/EK XRES 100/D5/EK PE 360; Drive Sam EVO 970; PS Seasonic Titanium 850w