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DDR RAM Overclocking Terminology FAQ

This Terminology FAQ covers overclocking for DDR RAM for both Intel and AMD platform and adds a reference material for various guides found on hisevilness.com. RAM overclocking can be time-consuming and involves a wide set of knowledge with various settings mostly accessible through the motherboard BIOS. As well as some abbreviation you come across when reading up on DDR RAM overclocking.

What is DDR*?

DDR stands for Double Data Rate and the number represent the version per JEDEC design. A RAM kit advertised speed is the speed in Mhz.

What is XMP?

XMP profile is a special profile that "overclocks" the RAM sticks above JEDEC spec(2133Mhz). This profile is always safe to use and is within the design spec of a specific DDR revision.

What is a DIMM?

DIMM stands for Dual In-line Memory Module and represent the stick or sticks in a RAM kit. A DIMM slot is a socket that is DDR version-specific in pin layout on the motherboard.

What is a Channel?

A channel is a direct link from a DIMM slot to the CPU socket and therefor CPU itself. Also known as traces that represent the physical pathway in the motherboard. There are several Channel layouts, Dual-Channel where the CPU can fully utilize RAM sticks in Mhz slotted in at least 2 DIMM slots. Quad Channel usually found on HEDT can fully utilize minimal 4 RAM sticks in DIMM slots in Mhz. Channels can be shared but this will sacrifice speed in Mhz and slightly increase latency.

What is an IC?

An IC is the physical silicone on a PCB of the RAM stick that presents the capacity of a RAM stick. Multiple ICs make up the whole capacity of the RAM stick and come in single rank(on 1 side of the PCB) or dual rank(on both sides of the PCB).

What is an IMC?

IMC stands for Internal Memory Controller and is located inside the CPU in the uncore/SoC domain. And handles communication with the motherboard chip, RAM, PCIe, IO etc.

What is NS?

NS stands for Nano Seconds and is the ability of a RAM kit to send and receive data in nanoseconds. Latency impacts the performance of read, write and copy speeds.

What is T-Topology?

Is a motherboard trace layout that will allow for better 4 DIMM support on dual-channel CPU's. While still sharing 1 channel for 2 DIMM they are made in such a way that the signal is shared equally among both DIMMs.

What is Daisy Chain?

Is a motherboard trace layout that allows dual-channel support CPUs to share each channel of a total of 4 DIMMs. This trace layout still favours the use of 2 DIMMs since the signal strength most commonly DIMM 2 and 4 is the best.

What are save voltages for DRAM?

Voltages for DRAM according to JEDEC spec should be able to handle up to 1.5v but this is not the case for specific ICs. While Samsung B-die can handle up to 1.5v the other Brand ICs such as Hynix or even Samsung E-die only can safely handle up to 1.45v. Higher voltages will require direct cooling such as water cooling with B-die over 1.5v and all the other revision of die over 1.45v.

All IC'sB-die
Ryzen SoC 1.20v ~ 1.45v 1.45v ~ 1.5v

What are save voltages for AMD SoC?

SoC voltage is the same for all architectures with the Ryzen CPUs. And are used when overclocking the FCLK(Infinity Fabric) and MCLK(Memory Frequency). And in some cases can help to stabilize CPU overclocking.

AMDCommunity
Ryzen SoC 1.000v ~ 1.150v 1.150 ~ 1.250

What are save voltages for Intel VCCIO and VCCSA?

Safe VCCIO and VCCSA voltages have been the same for about a decade and span several Intel nodes. Using extreme voltage could lead to damage of the IMC and motherboard traces.

Daily DriversExtreme
VCCIO Voltage 1.10v ~ 1.25v 1.25v ~ 1.30v
VCCSA Voltage 1.10v ~ 1.25v 1.25v ~ 1.30v

DDR RAM Overclocking Banner

DDR RAM Overclocking Terminology FAQ

DDR RAM Overclocking Terminology FAQ This Terminology FAQ covers overclocking for DDR RAM for both Intel and AMD platform and adds a reference material for various guides found on hisevilness.com. RAM
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Overclocking Guide for DDR4 RAM

This easy comprehensive guide illustrated with images is for the overclocking DDR4 using several brands such as Corsair and G.Skill with different IC's as an example. This guide is to supplement
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Intel Overclocking Terminology FAQ

Intel Overclocking Terminology FAQ. The Basics. This FAQ will answer the most common questions when overclocking Intel CPUs. This will cover Intel-based CPU's over about a decade. For the most part,
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