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The maximum random access memory (RAM) installed in any computer system is limited by hardware, software and economic factors. The hardware may have a limited number of address bus bits, limited by the processor package or design of the system. Some of the address space may be shared between RAM, peripherals, and read-only memory.
Many 32-bit computers have 32 physical address bits and are thus limited to 4 GiB (2 32 words) of memory. [3] [4] x86 processors prior to the Pentium Pro have 32 or fewer physical address bits; however, most x86 processors since the Pentium Pro, which was first sold in 1995, have the Physical Address Extension (PAE) mechanism, [5]: 445 which allows addressing up to 64 GiB (2 36 words) of memory.
LGA 1151, [1] also known as Socket H4, is a type of zero insertion force flip-chip land grid array (LGA) socket for Intel desktop processors which comes in two distinct versions: the first revision which supports both Intel's Skylake [2] and Kaby Lake CPUs, and the second revision which supports Coffee Lake CPUs exclusively.
RAM only No Yes RAM only Bus Interface DMI 3.0 x4 DMI 3.0 x8 (runs in x4 mode for Comet Lake-S CPUs) CPU support Comet Lake-S / Rocket Lake: Rocket Lake: Maximum DIMM slots 2 4 Maximum USB 2.0 ports 10 12 14 USB 3.2 ports configuration Gen 1x1 Up to 4 Up to 6 Up to 8 Up to 10 Up to 10 Gen 2 x1 — Up to 4 Up to 8 x2 Up to 2 Up to 3 Maximum SATA ...
CPU + GPU + RAM Haswell Refresh CPUs support Yes Broadwell CPUs support Yes Maximum DIMM slots 4 Maximum USB 2.0/3.0 ports 8 / 6 Maximum SATA 2.0/3.0 ports 0 / 6 CPU-attached PCI Express: 1 × PCIe 3.0 ×16 Either 1 × PCIe 3.0 ×16, 2 × PCIe 3.0 ×8, or 1 × PCIe 3.0 ×8 and 2 × PCIe 3.0 ×4 Chipset-attached PCI Express 8 × PCIe 2.0 ×1
The maximum number of banks per bank group remains at four (2 → 2), ... Ryzen 7000 and Ryzen 9000 series desktop processors also support DDR5 memory as standard.