ADATA Legend 970 Specifications

ADATA Legend 970 Performance

For this review, we’re testing the 2TB Legend 970 SSD. Comparables are a mixture of popular Gen4 SSDs and the first wave of Gen5 SSDs. Incidentally, all of the Gen5 are the same Phison E26 platform as the Legend 970.

• Samsung 990 Pro
• Seagate FireCuda 530
• Seagate FireCuda 540
• WD SN850X
• Gigabyte Aorus 10000
• Solidigm P44 Pro

For testing, we use two platforms. The consumer test platform that supports PCIe Gen4/Gen5 SSDs, and is sometimes leveraged for lighter consumer-based tests such as BlackMagic DiskSpeed Test and CrystalDiskMark, and our main platform, a Dell PowerEdge R760, which overlaps with our enterprise tests. For ultimate flexibility, we worked with Serial Cables, who supplied us with an 8-bay PCIe Gen5 JBOF for U.2/U.3, M.2, and E1.S/E3.S drive testing. This allows us to test all current and emerging drive types on the same test hardware.

Dell PowerEdge R760 Configuration

• Dual Intel Xeon Gold 6430 (32 cores/64 threads, 1.9GHz base)
• 1TB DDR5 RAM
• Ubuntu 22.04

VDBench Workload Analysis

When benchmarking storage devices, application testing is best, and synthetic testing is second. While not a perfect representation of actual workloads, synthetic tests help baseline storage devices with a repeatability factor that makes it easy to compare competing solutions. These workloads offer a range of testing profiles ranging from “four corners” tests and common database transfer size tests to trace captures from different VDI environments.

These tests leverage the common vdBench workload generator, with a scripting engine to automate and capture results over a large compute testing cluster. This allows us to repeat the same workloads across various storage devices, including flash arrays and individual storage devices. Our testing process for these benchmarks fills the entire drive surface with data, then partitions a drive section equal to one percent of the drive capacity to simulate how the drive might respond to application workloads. This differs from full entropy tests, which use 100 percent of the drive and take them to a steady state. As a result, these figures will reflect higher-sustained write speeds.

Profiles:

• 4K Random Read: 100% Read, 128 threads, 0-120% iorate
• 4K Random Write: 100% Write, 64 threads, 0-120% iorate
• 64K Sequential Read: 100% Read, 16 threads, 0-120% iorate
• 64K Sequential Write: 100% Write, 8 threads, 0-120% iorate
• VDI Profiles

Starting with 4K random read, the ADATA Legend 970 tied for second place, posting a peak of 989K IOPS at 128.6µs in latency. The ADATA Legend 970 graph line is charted directly under the Seagate Firecuda 540. The Solidigm P44 Pro that won overall is a 4th Gen drive.

The Gen5 SSD faired slightly worse when it came to writes. In this test, the drive barely made third place with a speed of 278k IOPS and a latency of 71.8µs. The Legend 970 once again lost to Gen4 drives.

The ADATA Legend 970 did fantastic when switched to the sequential read 64k workload. It came in first place, with a speed of 7.08GB/s and a latency of 281.4µs. This put it slightly ahead of the Seagate Firecuda 540, another 5th Gen drive.

Unfortunately, the Legend 970 fell to the back of the pack in sequential writes. The drive peaked at 1.40GB/s at a latency of 707.6µs.

Next, we looked at our VDI benchmarks, designed to tax the drives further. These tests include Boot, Initial Login, and Monday Login. The ADATA Legend 970 did well here, peaking a smidge above 200k IOPS and 168.1µs, for a second-place tie with the Seagate Firecuda 540 once again. However, both Gen5 drives were beaten by the Gen4 Solidigm P44 Pro.

For VDI Initial Login, the ADATA Legend 970 faired pretty well, ending the test with 66.7k IOPS and 447.8µs. The SSD was slower than some of the Gen4 drives if we measured from peak performance points. However, it was more stable than the Gen4 drives.

Lastly, we have the VDI Monday Login benchmark. This result is interesting because the Legend 970 was much more stable than the Gen4 drives while also coming in first place. Other than taking a slight performance hit at the end, the drive ended at 47.9K IOPS and 332.1µs.

Blackmagic Disk Speed Test

We measured performance inside a Windows 11 environment on our consumer test platform via the popular Blackmagic test. Here, the ADATA Legend 970 recorded 9.63GB/s write and 6.75GB/s read. These are nearly identical numbers to its two competitors.

CrystalDiskMark Speed Test

We performed a lighter-weight test on the ADATA Legend 970 to demonstrate its Gen5 speeds. Using CrystalDiskMark, we observed sequential transfer speeds exceeding 10GB/s for both read and write. The drive achieved 10.08GB/s for reads and 10.16GB/s for writes. CrystalDiskMark’s higher queue depth (compared to BlackMagic) allows us to showcase the best-case scenario for the drive. The speeds were very similar between the three drives, but the Legend 970 did come last in this test.

BootBench

BOOT-BENCH-1 is a workload profile adopted by OCP to profile SSDs designed for server boot duty. While this is intuitively a job for enterprise SSDs, client SSDs are often selected for their performance, capacity, and cost combination. The boot drive issue is germane not just to hyperscalers but also to server and storage system providers, as they face similar challenges.

This boot workload executes a relatively intense test plan that fills the entire drive with writes before testing a read-heavy workload sequence. For each test, it performs a 32K random read async operation alongside a 15MiB/s synchronous 128k random write and a 5MiB/s synchronous 128k random write/trim background workload. The script starts with the random-read activity at a 4-job level and scales up to 256-jobs at its peak. The final result is the read-operations performed during its peak run.

The OCP goal for this benchmark is a pass/fail at 60K read IOPS. Most drives we test will far exceed the minimum, but the results are instructive regardless.

With all this said, some tests end with DNFs, some produce results below the cut-off number, and others are just plain fast. The ADATA Legend 970 performed poorly, barely passing with 65632 IOPS. This suggests that the ADATA Legend 970 is probably unsuitable for OCP server boot duty. However, this is the first E26 Gen5 drive to pass the BootBench test, which we suppose is an improvement.

Final Thoughts

The ADATA Legend 970 Gen5 SSD delivered solid performance across most of our benchmark tests, aligning with our expectations based on prior evaluations of other Phison E26 controller-based drives.

 

Adata Legend 970 Port View

 

In terms of specific metrics, the Legend 970 performed well in most categories but exhibited some weaknesses. It secured a mid-pack position in both 4K and 64K sequential write tests. While it marginally outperformed other E26-powered Gen5 SSDs in these areas, it was nevertheless soundly defeated by high-end Gen4 drives by a significant margin.

 

A notable disappointment lies in the Bootbench testing, where the Phison controller struggled. The Firecuda 540 and Aorus 10000 both failed this benchmark. In contrast, the Legend 970 holds the distinction of being the first Gen5 drive to complete the test. Although the resulting scores were not particularly impressive, it did manage to edge out the other Gen5 drives by a slight degree.

 

Adata Legend 970 Label

 

Shifting to the more positive aspects, the ADATA Legend 970 stands out as one of the more capable Gen5 SSDs currently available. In VDBench Workload Analysis, it demonstrated slightly better performance than the Firecuda 540 and a notable lead over the Aorus 10000. When it came to Blackmagic and CrystalDiskMark tests, the results for all three SSDs—Legend 970, Firecuda 540, and Aorus 10000—were remarkably similar, showing only minor differences. Overall, this places the Legend 970 as the slightly higher-performing Gen5 drive in the market.

 

However, this marginal gain in performance comes at a steep cost. At its current price point, it is over $200 more expensive than the Firecuda 540. Given how closely matched the two SSDs are in terms of actual performance, it becomes challenging to make a compelling case for the Legend 970. The premium pricing is likely a result of its recent launch, and we anticipate that the cost will become more competitive as production volumes increase and the initial launch hype subsides.