Selling my high-end X299 platform in excellent working condition.1). ASUS TUF X299 Mark 1 is the more fully equipped premium version of ASUS’ X299 TUF lineup and carries forward the armored design philosophy of the classic ASUS Sabertooth/TUF boards.This is the full Mark 1 version with TUF Thermal Armor, reinforced TUF Fortifier metal backplate, SafeSlot reinforcement and VGA support, plus features such as dual Intel LAN, front USB 3.1 Gen 2 Type-C, BIOS Flashback and TUF Detective 2. The Mark 1 includes several premium hardware features that were not carried over to the more cost-focused Mark 2. ASUS itself describes the Fortifier as a reinforced backplate that improves both structural rigidity and cooling. 2). Intel Core i9-10900X — 10 cores / 20 threads.On this exact motherboard and my current cooling setup, the CPU has been running stable at 4.9 GHz all-core in normal/gaming workloads and up to 5.0 GHz with 1–4 active cores, using per-core Turbo Ratio settings, at 1.30V Vcore. Appropriate AVX offsets are used for heavier AVX workloads.With my 360mm AIO, temperatures are typically around 60–70°C in gaming and normal heavy workloads.3). Included memory is 32GB Crucial Ballistix MAX DDR4-4400, one of Crucial’s enthusiast/overclocking DDR4 kits. On this exact X299 setup it has been running stable at DDR4-4000 quad-channel, 19-19-19-46, including gaming and stability testing.Great platform for someone looking for a premium X299/HEDT setup with 10C/20T, quad-channel memory, lots of PCIe connectivity and strong overclocking capability.$550 OBOCPU + motherboard + 32GB RAM only. Cooler is not included.