L4 vs L40S
The L4 and the L40S are both data centre GPUs we supply tested from Hong Kong, and the figures below are the same ones published on each product page. They share the same supply and warranty terms and separate on memory, power, interface, so the decision is less about "which is better" and more about which of those differences your platform or workload can actually use.
Nothing on this page is a price: used and refurbished hardware is repriced weekly, so both are quoted on request against confirmed stock with the date the quote holds until. If you are replacing a part, send the platform and we will confirm the population before you commit.
Side by side
L4 vs L40S specifications
| Specification | L4 | L40S |
|---|---|---|
| Memory | 24GB GDDR6 ECC, 300 GB/s | 48GB GDDR6 with ECC, 864 GB/s |
| Power | 72W TDP — no external power connector | 350W TDP, 16-pin (CEM5) power connector |
| Interface | PCIe Gen4 x16, single-slot low-profile, passive | PCIe Gen4 x16, dual-slot full-height, passive |
| Architecture | Ada Lovelace, 7,424 CUDA cores, 232 Tensor cores | Ada Lovelace, 18,176 CUDA cores, 568 fourth-gen Tensor cores, 142 third-gen RT cores |
| Compute | FP8 242 TFLOPS / FP16 121 TFLOPS / TF32 60 TFLOPS | FP8 733 TFLOPS / FP16-BF16 362 TFLOPS / TF32 183 TFLOPS / FP32 91.6 TFLOPS |
| NVLink / MIG | not stated | No NVLink; MIG not supported on this board |
| Virtualization | vGPU support, NVIDIA AI Enterprise ready | vGPU supported; NVIDIA AI Enterprise ready |
| Model | NVIDIA L4 (900-2G193-0000-000) | NVIDIA L40S 48GB PCIe; OEM-branded Dell / Lenovo / HP boards are the same GPU |
| Media | 2x NVENC, 4x NVDEC, 4x JPEG — AV1 encode | 3x NVENC / 3x NVDEC — AV1 encode and decode |
Rows that differ are highlighted. Figures are the same ones published on each product page; where a figure is community-sourced rather than vendor-published it is stated on that page. Confirm every part against your build sheet when ordering.
Where they differ
- ·Memory — L4: 24GB GDDR6 ECC, 300 GB/s; L40S: 48GB GDDR6 with ECC, 864 GB/s.
- ·Power — L4: 72W TDP — no external power connector; L40S: 350W TDP, 16-pin (CEM5) power connector.
- ·Interface — L4: PCIe Gen4 x16, single-slot low-profile, passive; L40S: PCIe Gen4 x16, dual-slot full-height, passive.
- ·Architecture — L4: Ada Lovelace, 7,424 CUDA cores, 232 Tensor cores; L40S: Ada Lovelace, 18,176 CUDA cores, 568 fourth-gen Tensor cores, 142 third-gen RT cores.
- ·Compute — L4: FP8 242 TFLOPS / FP16 121 TFLOPS / TF32 60 TFLOPS; L40S: FP8 733 TFLOPS / FP16-BF16 362 TFLOPS / TF32 183 TFLOPS / FP32 91.6 TFLOPS.
- ·Virtualization — L4: vGPU support, NVIDIA AI Enterprise ready; L40S: vGPU supported; NVIDIA AI Enterprise ready.
- ·Media — L4: 2x NVENC, 4x NVDEC, 4x JPEG — AV1 encode; L40S: 3x NVENC / 3x NVDEC — AV1 encode and decode.
Decision
Which one to buy
Data centre GPUs are chosen by memory footprint per job and by the deployment you already have. More memory per card means bigger models, larger batches and fewer cards for the same workload; less memory per card is often the better buy when you scale out across many nodes. Memory bandwidth and compute format matter for the workload — FP8 and BF16 throughput for inference, FP64 for simulation — and the power envelope decides how many cards fit per chassis. Check the form factor and cooling as well: a passive server card and an actively cooled workstation card are not interchangeable.
Choose the L4 if
- ·Memory: 24GB GDDR6 ECC, 300 GB/s
- ·Power: 72W TDP — no external power connector
- ·Interface: PCIe Gen4 x16, single-slot low-profile, passive
Choose the L40S if
- ·Memory: 48GB GDDR6 with ECC, 864 GB/s
- ·Power: 350W TDP, 16-pin (CEM5) power connector
- ·Interface: PCIe Gen4 x16, dual-slot full-height, passive
Frequently asked questions
How much do the L4 and the L40S cost?
We do not publish prices for either: secondary-market hardware is repriced weekly. Send the quantity, the platform and the condition you want and we quote both against confirmed stock, with the date the figure holds until.
What is the main difference between the L4 and the L40S?
Memory (L4: 24GB GDDR6 ECC, 300 GB/s; L40S: 48GB GDDR6 with ECC, 864 GB/s); Power (L4: 72W TDP — no external power connector; L40S: 350W TDP, 16-pin (CEM5) power connector); Interface (L4: PCIe Gen4 x16, single-slot low-profile, passive; L40S: PCIe Gen4 x16, dual-slot full-height, passive).
Can I use the L4 and the L40S in the same system?
They can share a server if the power and slot budget allows it, but they target different jobs: L4 and L40S differ mainly on Memory and Power. Mixed GPU models in one host is a driver/CUDA compatibility decision, not a hardware one.
Which one should I buy?
Buy the one whose strong points match the job: see the "Choose" section above. If you are replacing an existing part, send the platform or the old part number and we will confirm compatibility before you order.
What condition are they in, and do you ship worldwide?
Both are supplied tested with a 1-year written warranty. Condition is stated line by line before you order — new, decommissioned pull or OEM tray — and we ship worldwide from the Hong Kong warehouse with full export documentation, typically 3–7 days by air.
Get a quote for either — or both
Tell us the quantity, the platform and the condition you need. We confirm stock and put a firm figure in writing with the date it holds until.
Request a Quote