Template:mpu Xeon Gold 6138T is a 64-bit 20-core x86 multi-socket high performance server microprocessor introduced by Intel in mid-2017. This chip supports up to 4-way multiprocessing. The Gold 6138T, which is based on the server configuration of the Skylake microarchitecture and is manufactured on a 14 nm+ process, sports 2 AVX-512 FMA units as well as three Ultra Path Interconnect links. This microprocessor, which operates at 2 GHz with a TDP of 125 W and a turbo boost frequency of up to 3.7 GHz, supports up 768 GiB of hexa-channel DDR4-2666 ECC memory.

Cache

Main article: Skylake § Cache

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Cache Organization Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory. The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC. Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies. Note: All units are in kibibytes and mebibytes.

L1$ 1.25 MiB 1,280 KiB 1,310,720 B L1I$ 640 KiB 655,360 B 0.625 MiB 20x32 KiB 8-way set associative   L1D$ 640 KiB 655,360 B 0.625 MiB 20x32 KiB 8-way set associative write-back L2$ 20 MiB 20,480 KiB 20,971,520 B 0.0195 GiB     20x1 MiB 16-way set associative write-back L3$ 27.5 MiB 28,160 KiB 28,835,840 B 0.0269 GiB     20x1.375 MiB 11-way set associative write-back

Memory controller

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	Integrated Memory Controller
	Max Type DDR4-2666 Supports ECC Yes Max Mem 768 GiB Controllers 2 Channels 6 Max Bandwidth 119.21 GiB/s 122,071.04 MiB/s 128.001 GB/s 128,000.763 MB/s 0.116 TiB/s 0.128 TB/s Bandwidth Single 19.87 GiB/s Double 39.74 GiB/s Quad 79.47 GiB/s Hexa 119.21 GiB/s

Expansions

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	Expansion Options
	PCIe Revision 3.0 Max Lanes 48 Configs x16, x8, x4

Features

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Supported x86 Extensions & Processor Features

MMX MMX Extension EMMX Extended MMX Extension SSE Streaming SIMD Extensions SSE2 Streaming SIMD Extensions 2 SSE3 Streaming SIMD Extensions 3 SSSE3 Supplemental SSE3 SSE4.1 Streaming SIMD Extensions 4.1 SSE4.2 Streaming SIMD Extensions 4.2 AVX Advanced Vector Extensions AVX2 Advanced Vector Extensions 2 AVX-512 Advanced Vector 512-bit AVX512F AVX-512 Foundation AVX512CD AVX-512 Conflict Detection AVX512BW AVX-512 Byte and Word AVX512DQ AVX-512 Doubleword and Quadword Instructions AVX512VL AVX-512 Vector Length ABM Advanced Bit Manipulation BMI1 Bit Manipulation Instruction Set 1 BMI2 Bit Manipulation Instruction Set 2 FMA3 3-Operand Fused-Multiply-Add AES AES Encryption Instructions RdRand Hardware RNG ADX Multi-Precision Add-Carry CLMUL Carry-less Multiplication Extension F16C 16-bit Floating Point Conversion x86-16 16-bit x86 x86-32 32-bit x86 x86-64 64-bit x86 Real Real Mode Protected Protected Mode SMM System Management Mode FPU Integrated x87 FPU NX No-eXecute HT Hyper-Threading TBT 2.0 Turbo Boost Technology 2.0 EIST Enhanced SpeedStep Technology SST Speed Shift Technology TXT Trusted Execution Technology (SMX) vPro Intel vPro VT-x VT-x (Virtualization) VT-d VT-d (I/O MMU virtualization) EPT Extended Page Tables (SLAT) TSX Transactional Synchronization Extensions VMD Volume Management Device NM Node Manager KPT Key Protection Technology PTT Platform Trust Technology Run Sure Run Sure Technology (RAS Capability) MBE Ctrl Mode-Based Execute Control Node Ctrlr Node Controller Support

Frequencies

See also: Intel's CPU Frequency Behavior

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Mode	Base	Turbo Frequency/Active Cores
		1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Normal	2,000 MHz	3,700 MHz	3,700 MHz	3,500 MHz	3,500 MHz	3,400 MHz	3,400 MHz	3,400 MHz	3,400 MHz	3,200 MHz	3,200 MHz	3,200 MHz	3,200 MHz	2,900 MHz	2,900 MHz	2,900 MHz	2,900 MHz	2,700 MHz	2,700 MHz	2,700 MHz	2,700 MHz
AVX2	1,500 MHz	3,600 MHz	3,600 MHz	3,400 MHz	3,400 MHz	3,100 MHz	3,100 MHz	3,100 MHz	3,100 MHz	2,600 MHz	2,600 MHz	2,600 MHz	2,600 MHz	2,300 MHz	2,300 MHz	2,300 MHz	2,300 MHz	2,200 MHz	2,200 MHz	2,200 MHz	2,200 MHz
AVX512	1,200 MHz	3,500 MHz	3,500 MHz	3,200 MHz	3,200 MHz	2,500 MHz	2,500 MHz	2,500 MHz	2,500 MHz	2,100 MHz	2,100 MHz	2,100 MHz	2,100 MHz	1,900 MHz	1,900 MHz	1,900 MHz	1,900 MHz	1,800 MHz	1,800 MHz	1,800 MHz	1,800 MHz