DDR4 vs DDR5: which memory generation is right for your build?

The memory generation change that's now mainstream — with real caveats.

DDR5 doubles DDR4's per-channel bandwidth (two 32-bit sub-channels per DIMM vs a single 64-bit channel) and more than doubles typical per-module capacity. It's the memory standard every new Intel and AMD platform uses in 2026. But raw latency hasn't improved proportionally: a DDR5-6000 CL30 kit has the same 10 ns first-word latency as DDR4-3200 CL16, and tight-tuned DDR4-3600 CL16 is actually faster in absolute terms.

See DDR5-6000 CL30 latency

The 2026 DDR5 sweet-spot kit, 10.0 ns first-word.

See DDR4-3200 CL16 latency

The DDR4 baseline — identical 10.0 ns latency.

See tight-tuned DDR4-3600 CL16

Why a tuned DDR4 kit can beat stock DDR5 on latency.

Option A

DDR4

Wins 2 of 12 compared specs

Option B

DDR5

Wins 10 of 12 compared specs

Side-by-side specs

Spec	DDR4	DDR5
Typical mainstream speed	3200-3600 MT/s	5600-6400 MT/s (better on this spec)
Peak per-channel bandwidth	25.6 GB/s	48 GB/s (better on this spec)
Best first-word latency	~8.9 ns (3600 CL16) (better on this spec)	~10 ns (6000 CL30)
Voltage (nominal)	1.2 V	1.1 V (better on this spec)
On-DIMM voltage regulation	Motherboard	PMIC per module (better on this spec)
Max per-module capacity	32 GB	64 GB (128 GB emerging) (better on this spec)
Channels per DIMM	1 × 64-bit	2 × 32-bit sub-channels (better on this spec)
Error correction (consumer)	None	On-die ECC (better on this spec)
Platform support (2026)	Legacy AM4 / LGA1200/1700	All current platforms (better on this spec)
Relative kit price	Lower (better on this spec)	Slightly higher
Good for gaming	Still competitive	Default choice (better on this spec)
Good for productivity / VMs	Adequate	Meaningfully better (better on this spec)

How they differ

DDR5's advantage is bandwidth and capacity, not latency. A DDR5-6000 kit delivers 48 GB/s per channel vs DDR4-3200's 25.6 GB/s — meaningful for memory-bandwidth-bound workloads like large-scale compilation, video encoding, and running virtual machines. Max per-DIMM capacity doubles (64 GB DDR5 modules ship; DDR4 taps out around 32 GB). On the negative side, DDR5 runs at 1.1 V nominal vs DDR4's 1.2 V (similar idle power, slightly higher under load due to on-module voltage regulation), and early adoption meant higher kit prices — now mostly normalised by 2026. Platform compatibility is the forced-choice factor: Intel 12th-gen and older Ryzen 5000 use DDR4; Intel 13th-gen+ and Ryzen 7000+ require DDR5 exclusively on their newer boards.

Verdict

DDR5 is the right answer for any new build in 2026 — all current-gen platforms use it, kit prices are competitive, and the bandwidth advantage is real for productivity workloads. DDR4 is only the right choice if you're upgrading an existing DDR4 AM4 / LGA1200 / LGA1700 system where replacing the motherboard doesn't make sense.

See DDR5-6000 CL30 latency

Which should you pick?

Choose DDR4

Pick DDR4 only for DDR4-based platform upgrades (Ryzen 5000 on AM4, Core 10th-12th gen on LGA1200/1700), or for ultra-budget builds where a used DDR4 kit is genuinely cheaper.

Compare DDR4-3600 CL16 latency

Choose DDR5

Pick DDR5 for any new platform purchase. All Ryzen 7000/9000 and Intel Core 13th/14th/15th-gen motherboards require DDR5, and the bandwidth advantage directly translates to performance in memory-heavy workloads.

See DDR5-6000 CL30 latency