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RAM Comparison Tool

Compare up to 4 RAM modules side-by-side on price per GB, speed, CAS latency, capacity, and form factor. Search from 4,200+ live-priced modules.

Modules

4,200+

Compare up to

4 at once

Updated

Daily

True latency

Calculated

Quick Compare

Picks best $/GB per brand — updated daily

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Use a quick compare preset above, or search to add up to 4 RAM modules.

How to Use This Tool

1

Pick a preset or search

Use a quick-compare preset to load popular matchups instantly, or search by name, brand, or ASIN.

2

Add up to 4 modules

Click any result to add it. The comparison grid builds as you go.

3

Read the verdict

The best value column (lowest $/GB) is highlighted in amber. The fastest true latency is highlighted in green.

4

Share your comparison

Hit "Copy share link" to get a URL that restores your exact comparison for anyone.

What Each Spec Actually Means

A quick reference for every row in the comparison table — what to look for and why it matters.

SpecWhat it isWhat to look for
PriceTotal cost of the kitLowest price for your required capacity
$/GBPrice divided by total GB — the best single value metricLower is better. Ignore total price without this.
True LatencyReal-world delay in nanoseconds: (CAS ÷ MHz) × 2000Lower ns = faster response. More useful than CAS alone.
TypeDDR generation — DDR4 or DDR5Must match your motherboard. They are not interchangeable.
SpeedClock rate in MHz (e.g. DDR4-3200, DDR5-6000)AM4 sweet spot: DDR4-3600. AM5 sweet spot: DDR5-6000.
CapacityTotal GB in the kit (e.g. 16GB = 2×8GB)16GB minimum for gaming. 32GB for content creation.
CAS LatencyColumn Address Strobe — clock cycles before data is returnedLower CL at the same speed = faster. Always pair with MHz.
Form FactorPhysical size — DIMM (desktop) or SO-DIMM (laptop)Must match your system. Cannot be swapped.
VoltageOperating voltage (DDR4 standard: 1.35V, DDR5: 1.1V)Higher voltage kits may need XMP/EXPO enabled in BIOS.

Related Pages

RAM Finder ToolPrice/GB CalculatorBest RAM DealsDDR4 vs DDR5Corsair vs G.SkillRAM Buying Guide

RAM Comparison FAQ

How do I compare RAM modules effectively?

Focus on price per GB first — it is the most objective value metric. Then check speed (MHz) and CAS latency for your platform's sweet spot. For AMD AM5, DDR5-6000 CL30 is optimal. For AMD AM4, DDR4-3600 CL16 is the sweet spot.

Does higher MHz always mean better RAM?

No. True latency depends on both speed and CAS latency. DDR4-3200 CL14 can have lower actual latency than DDR4-3600 CL18. Use the formula: (CAS / Speed) × 2000 to calculate true latency in nanoseconds.

Should I compare DDR4 and DDR5 directly?

Only if you are choosing a platform. DDR4 and DDR5 are physically incompatible — you cannot mix them. If your motherboard supports DDR4, compare DDR4 modules only. For new builds on AMD AM5 or Intel LGA1851, compare DDR5 modules.

What is the most important spec to compare?

For most buyers: price per GB first, then capacity, then speed. For gaming: CAS latency matters more than raw MHz. For content creation: capacity is the priority. For servers: ECC support is non-negotiable.

How many RAM modules should I compare at once?

Two to three is ideal. Comparing more than four at once makes it hard to spot differences. Start by comparing the top two candidates by price per GB, then add a third if you need a tiebreaker on speed or brand.

What is "true latency" and why does it matter?

True latency (in nanoseconds) is calculated as (CAS Latency ÷ Speed) × 2000. It tells you the actual delay in real time, not just the CAS number. DDR4-3200 CL14 (8.75 ns) is faster than DDR4-3600 CL18 (10.0 ns) despite the lower MHz rating.

Can I share my RAM comparison with someone?

Yes. Once you have 2 or more modules selected, click "Copy share link" at the bottom of the comparison table. The URL encodes your exact selection — anyone who opens it will see the same comparison loaded automatically.

Can I compare laptop and desktop RAM?

You can compare specs, but they are not interchangeable. Desktop RAM uses DIMM form factor; laptop RAM uses SO-DIMM. Always check the form factor column when comparing to ensure you are buying the right type for your device.