In StorageReview’s same-chassis test, the NVIDIA RTX PRO 4500 Blackwell Server Edition delivered a median 2.7× the output throughput of an NVIDIA L4 across 18 workload combinations at 8–32 concurrent requests. At 32 concurrent requests, the test systems drew about 301W with the RTX PRO 4500 and 196W with the L4. The result points to a substantial throughput and queueing improvement in this particular vLLM benchmark—not a universal 2.7× gain for every model or deployment.
What StorageReview tested
StorageReview ran the RTX PRO 4500 Blackwell Server Edition and the NVIDIA L4 in the same HPE ProLiant DL145 Gen11 server, using vLLM and the Metrum AI Bench Platform. Its principal throughput sweep covered 18 input/output combinations across Qwen3.5-4B and Gemma 4 E4B, with both models tested in BF16 precision.
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The reported 2.7× figure is the median output-throughput ratio across those combinations at 8–32 concurrent requests. At 256 concurrent requests, StorageReview reported a 3.0×–3.2× throughput advantage for the RTX PRO 4500. These are benchmark results for the stated models, precision, server and serving setup; they do not establish the same multiplier for other model sizes, quantizations, frameworks or workloads.
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Generation speed and queueing
StorageReview reported generation at 12–15 ms per token on the RTX PRO 4500, compared with 35–40 ms on the L4. Under the review’s 256-concurrent-request conditions, median time to first token on the 4500 remained between 264 and 650 ms for 256-token prompts. The L4’s median time to first token rose to 9 seconds and 39 seconds in the cited test conditions.
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Those latency figures are specific to the tested prompt and load conditions. They illustrate why a throughput result can matter to an interactive service: when requests queue, the delay before generation begins may be as important to users as aggregate tokens per second.
One RTX PRO 4500 versus multiple L4s
StorageReview says one tested DL145 Gen11 configuration can accommodate up to three L4 cards. In its comparison, three L4s serving 32 sessions each came close to one RTX PRO 4500 in throughput. That is a configuration-specific comparison, not a general claim that one 4500 always replaces three L4s. The review’s case for the 4500 at the box level also rests on per-user speed, latency, one 32GB memory pool and FP4 capability.
Power: compare the same boundary
At 32 concurrent requests, StorageReview measured about 196W of whole-server draw for the L4 system and about 301W for the RTX PRO 4500 system—roughly 105W more for the latter. These are system-level figures, not GPU board-power measurements.
Despite the higher system draw, the review reported more output tokens per system watt with the 4500. On Qwen3.5-4B, the reported figure rose from 2.7 to 5.1; on Gemma 4 E4B, it rose from 2.9 to 5.6. StorageReview characterized the improvement as 1.3×–1.4× better output tokens per GPU watt. Keep that reported efficiency comparison distinct from the whole-server watt readings: the power boundary and metric matter when estimating operating costs.
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BF16 results are separate from the FP4 claim
The 2.7× headline result comes from a BF16 comparison. The RTX PRO 4500 also supports FP4, which the L4 does not, but an FP4 result is not a like-for-like extension of the BF16 sweep. StorageReview separately tested Gemma 4 26B-A4B in NVFP4 on the 4500.
StorageReview relayed NVIDIA’s “over 5x” claim as dependent on FP4 and NVIDIA NIM. Because that claim uses different precision and serving conditions from the review’s BF16 comparison, it should not be treated as a direct comparison with the 2.7× result.
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Will the RTX PRO 4500 fit a DL145 Gen11?
HPE QuickSpecs list the HPE NVIDIA RTX PRO 4500 Blackwell Server Edition 32GB PCIe Accelerator, SKU S6W30C, as supported in the DL145 Gen11 with the 1U heatsink configuration. The QuickSpecs table includes support categories at 35°C, 40°C and 45°C. That listing is useful evidence of platform support, but it does not confirm that a particular server has the right installed parts or configuration.
NVIDIA’s product specifications describe the Server Edition card as a single-slot, full-height/full-length passive accelerator with 32GB of GDDR7 memory, PCIe 5.0 x16 and a 16-pin PCIe CEM5 power connector. Its maximum power consumption is 165W. The manufacturer lists a size of 4.4 inches high by 10.5 inches long and up to two MIG instances of 16GB each. These are product specifications, not results measured in StorageReview’s benchmark.
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Before ordering or installing a card, verify the exact server revision and regional SKU, the installed riser, the 16-pin power feed, required 1U heatsink and airflow configuration, and the applicable ambient-temperature support category. StorageReview’s tested server had the full-length riser and power cable; your system may differ. HPE’s Singapore Store identifies S6W30C as the RTX PRO 4500 Blackwell Server Edition 32GB PCIe Accelerator for HPE, but that regional listing does not establish availability elsewhere.
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The strongest case is for an operator already using a DL145 Gen11 and L4 who needs higher per-user response and throughput on workloads resembling the tested small BF16 models. The 4500’s 32GB memory pool and separate FP4 capability may also matter when choosing a deployment configuration, but the benchmark’s 2.7× figure does not quantify every benefit of those differences.
The evidence is one publication’s benchmark on one server platform using its Metrum AI Bench and vLLM setup. It does not rank the RTX PRO 4500 against the full current inference-GPU lineup, including the L40S and RTX PRO 6000 Server Edition; StorageReview scoped its comparison to the L4. HPE separately said in an April 2026 release that a version of the DL145 Gen11 based on the RTX PRO 4500 was validated in MLPerf Inference v6.0 results. That is HPE’s attributed platform statement, not evidence for StorageReview’s 2.7× measurement.
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