AMD Radeon Instinct MI60 vs NVIDIA L20 Comparison

The NVIDIA L20 and AMD Radeon Instinct MI60 represent two distinct generations of server-class accelerators, and the recorded benchmark data shows a decisive performance gap between them. The L20, built on the Ada Lovelace architecture, delivers average scores of 251,147 across the database's test suite, placing it in the 99th percentile of all GPUs. The MI60, using the older GCN 5.1 architecture, averages 92,466, which places it in the 93rd percentile. While both are dual-slot, 267 mm cards, they serve fundamentally different workloads and performance tiers.

Where Each One Wins

The benchmark results are unambiguous in their scoring. The NVIDIA L20 wins both recorded head-to-head tests, with the AMD Radeon Instinct MI60 failing to secure a single victory. In the Geekbench OpenCL test, the L20 scores 274,276 against the MI60's 92,488, a difference of 196.6%. In the Vulkan test, the L20 scores 228,018 against 92,444, a difference of 146.7%. These are not marginal differences; the L20 is operating in a completely different performance class.

However, the MI60 has its own advantages that are not captured in raw compute benchmarks. The MI60 uses HBM2 memory with a 4096-bit bus, delivering 1.02 TB/s of bandwidth, which exceeds the L20's 864.0 GB/s from its 384-bit GDDR6 configuration. For memory-bound workloads where data movement is the bottleneck, the MI60's higher bandwidth could be relevant, even though its overall compute throughput is far lower. The MI60 also supports a 2:1 FP16 ratio, delivering 29.49 TFLOPS in half-precision versus its 14.75 TFLOPS in FP32, while the L20 provides 59.35 TFLOPS in both FP16 and FP32. The L20's FP16 capability is more flexible for mixed-precision work, but the MI60's dedicated FP16 throughput was a notable feature at its release.

The MI60 is also end-of-life in production status, while the L20 remains active. This means the L20 is the current product, while the MI60 is a legacy part. For new deployments, the L20 is the available option; for existing infrastructure, the MI60's 32 GB of HBM2 memory and 1.02 TB/s bandwidth might still serve specific roles.

The Verdict

The data points to a clear recommendation for most users: the NVIDIA L20 is the superior choice across all benchmarked workloads. With a 99th percentile ranking versus the MI60's 93rd, and wins in both OpenCL and Vulkan by margins of 196.6% and 146.7% respectively, the L20 offers roughly two to three times the performance. It also provides 48 GB of memory compared to 32 GB, 11,776 shading units versus 4,096, and 368 tensor cores where the MI60 has none. The L20's architecture is newer, its production status is active, and its transistor density is 125.3 million per square millimeter versus 40.0 million on the MI60.

The MI60 should only be considered by users who have a specific need for its 1.02 TB/s memory bandwidth or its 4096-bit bus width, and who cannot move to a newer part. Its FP16 performance at 29.49 TFLOPS is respectable for its era, but the L20 matches that in FP32 and doubles it in FP16 (59.35 TFLOPS). The MI60's 300 W TDP is slightly higher than the L20's 275 W, yet it delivers far less compute per watt. There is no benchmark scenario in the recorded data where the MI60 wins, so the recommendation is straightforward: choose the L20 for current projects, and reserve the MI60 for legacy integration where its memory subsystem is essential.

Head-to-Head Benchmarks

The first recorded test is Geekbench OpenCL. The NVIDIA L20 scores 274,276, while the AMD Radeon Instinct MI60 scores 92,488. The L20 leads by 196.6%, meaning it is nearly three times faster in this API. This is the larger of the two margins, reflecting the L20's advantage in general compute workloads. The L20's FP32 throughput of 59.35 TFLOPS dwarfs the MI60's 14.75 TFLOPS, and the shading unit count (11,776 versus 4,096) explains much of this gap.

The second test is Geekbench Vulkan. The L20 scores 228,018, and the MI60 scores 92,444. The L20 wins by 146.7%. While the margin is smaller than OpenCL, it is still a dominant victory. The L20's Vulkan score is lower than its OpenCL score (228,018 versus 274,276), while the MI60's scores are nearly identical across both APIs (92,444 versus 92,488). This suggests the L20 has a more pronounced advantage in compute-oriented APIs, while the MI60's performance is consistent but low.

The L20's nearest rivals in the database include the NVIDIA L40 with an average score of 284,111 and the RTX 6000 Ada Generation at 287,237. The L20 sits 11.6% behind the L40 and 12.6% behind the RTX 6000. This places the L20 just below the top-tier Ada cards, but still far above the MI60's competitive set. The MI60's nearest rivals are the NVIDIA RTX A4500 at 91,671 (0.9% behind the MI60) and the RTX A4500 Mobile at 91,134 (1.5% behind). The MI60 also trails the AMD Radeon Pro VII by 4.8% and the Radeon RX 7900M by 5.2%. This positioning shows the MI60 is competitive with mid-range workstation cards from its generation, but it cannot approach the L20's performance tier.

FAQ

Q: Which GPU has higher raw compute performance in the recorded benchmarks?

A: The NVIDIA L20 wins both recorded tests. In Geekbench OpenCL, it scores 274,276 versus 92,488 for the MI60, a 196.6% lead. In Geekbench Vulkan, it scores 228,018 versus 92,444, a 146.7% lead.

Q: Does the AMD Radeon Instinct MI60 have any advantage in memory bandwidth?

A: Yes, the MI60 has 1.02 TB/s of bandwidth from its HBM2 memory on a 4096-bit bus, while the L20 has 864.0 GB/s from GDDR6 on a 384-bit bus. The MI60's bandwidth is approximately 18% higher, though this does not translate to higher compute scores in the recorded data.

Q: How do the two cards compare in terms of FP16 performance?

A: The L20 delivers 59.35 TFLOPS in FP16 with a 1:1 ratio to FP32. The MI60 delivers 29.49 TFLOPS in FP16 with a 2:1 ratio to FP32, meaning its FP16 is double its FP32 rate. The L20 still has double the absolute FP16 throughput.

Q: What is the production status of each GPU?

A: The NVIDIA L20 is listed as active in production. The AMD Radeon Instinct MI60 is listed as end-of-life.

Q: How does the L20 compare to its own nearest rivals?

A: The L20 averages 251,147, which is 11.6% behind the NVIDIA L40 (284,111) and 12.6% behind the RTX 6000 Ada Generation (287,237). It is 11.6% ahead of the NVIDIA PG506-232 (225,124) and 14.2% ahead of the AMD Radeon PRO W7900D (219,827).

Q: How does the MI60 compare to its own nearest rivals?

A: The MI60 averages 92,466, which is 0.9% ahead of the NVIDIA RTX A4500 (91,671) and 1.5% ahead of the RTX A4500 Mobile (91,134). It is 4.8% behind the AMD Radeon Pro VII (97,131) and 5.2% behind the Radeon RX 7900M (97,487).

Architecture Differences

The NVIDIA L20 uses the AD102 chip on the Ada Lovelace architecture, built on a 5 nm process at TSMC. It contains 76,300 million transistors on a 609 mm² die, yielding a transistor density of 125.3 million per square millimeter. The architecture supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. It includes 92 ray tracing cores and 368 tensor cores, features that are entirely absent from the MI60.

The AMD Radeon Instinct MI60 uses the Vega 20 chip on the GCN 5.1 architecture, built on a 7 nm process at TSMC. It contains 13,230 million transistors on a 331 mm² die, yielding a transistor density of 40.0 million per square millimeter. The architecture supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.3. It has no ray tracing cores and no tensor cores, reflecting its older design focus on compute rather than graphics acceleration.

The L20's Ada Lovelace architecture includes 11,776 shading units, 368 texture mapping units, and 128 render output units. The MI60 has 4,096 shading units, 256 texture mapping units, and 64 render output units. The L20's pixel rate is 322.6 GPixel/s versus 115.2 GPixel/s for the MI60, and its texture rate is 927.4 GTexel/s versus 460.8 GTexel/s. The L20's transistor density advantage (125.3M vs 40.0M per mm²) reflects the generational leap in manufacturing and design efficiency.

Specification Differences

The two cards differ in nearly every measurable specification. The NVIDIA L20 has 48 GB of GDDR6 memory, while the AMD Radeon Instinct MI60 has 32 GB of HBM2. The memory bus widths are 384-bit for the L20 and 4096-bit for the MI60. The L20's memory operates at 18 Gbps effective, while the MI60's runs at 2 Gbps effective, yielding bandwidths of 864.0 GB/s and 1.02 TB/s respectively.

Clock speeds differ significantly. The L20 has a base clock of 1440 MHz and a boost clock of 2520 MHz. The MI60 has a base clock of 1200 MHz and a boost clock of 1800 MHz. The L20's higher boost clock, combined with more cores, produces its massive compute advantage.

Power specifications show the L20 at 275 W TDP with a suggested 600 W PSU and a single 16-pin power connector. The MI60 is rated at 300 W TDP with a suggested 700 W PSU and uses a 6-pin plus 8-pin connector configuration. Both are dual-slot cards with identical dimensions of 267 mm in length and 111 mm in height.

Display outputs differ: the L20 has four DisplayPort 1.4a outputs, while the MI60 has a single mini-DisplayPort 1.4a output. Both use PCIe 4.0 x16 interfaces. The L20 was released on 2023-11-15, while the MI60 was released on 2018-11-17. The L20's predecessor is listed as Server Ampere and its successor as Server Hopper, while the MI60's predecessor is FirePro Data Center with no successor listed.