A A measure of how well an SSD performs under typical consumer workloads. Samsung 850 Pro ≈ 100%.
Measuring SSD performance is not for the faint-hearted. There are a plethora of speed readings available. A disproportionate emphasis can easily be placed on technical readings which don't translate into improved performance for typical users. The effective speed index is a measure of how well an SSD performs under typical consumer workloads: 50% sequential with an emphasis on lower queue depth performance. The details of the calculation are explained below.

Drive performance is broken into the below six categories: The real world speed index weighs the above factors in the following proportions:
  • SeqR=25%
  • SeqW=25%
  • 4kR=17%
  • 4kW=17%
  • 4k64R=8%
  • 4k64W=8%
These weights were chosen because the majority of consumer IO (approx 50%) is sequential and the least common type of IO is deep queue depth. Consumer workloads rarely go beyond a queue depth of 4.

For comparison purposes here are the popular AS-SSD total score formula (approximate) weights:
  • SeqR=5%
  • SeqW=6%
  • 4kR=6%
  • 4kW=9%
  • 4k64R=46%
  • 4k64W=28%
There is a heavy bias (74%) on deep queue depth performance, something typical consumers are unlikely to benefit from. The AS-SSD benchmark total score is a far better gauge for server rather than consumer workloads.

 

See a current list of SSDs and their effective speeds (Avg. bench) here.

Why does UserBenchmark have a bad reputation on reddit?
Marketers operate thousands of reddit accounts. Our benchmarks expose their spiel so they attack our reputation.
Why don’t PC brands endorse UserBenchmark?
Brands make boatloads on flagships like the 4090 and 14900KS. We help users get similar real-world performance for less money.
Why don’t youtubers promote UserBenchmark?
We don't pay youtubers, so they don't praise us. Moreover, our data obstructs youtubers who promote overpriced or inferior products.
Why does UserBenchmark have negative trustpilot reviews?
The 200+ trustpilot reviews are mostly written by virgin marketing accounts. Real users don't give a monkey's about big brands.
Why is UserBenchmark popular with users?
Instead of pursuing brands for sponsorship, we've spent 13 years publishing real-world data for users.
The Best
CPUGPUSSD
Intel Core i5-12600K $162Nvidia RTX 4060 $290WD Black SN850X M.2 2TB $140
Intel Core i5-13600K $235Nvidia RTX 4060-Ti $378WD Black SN850X M.2 1TB $89
Intel Core i5-12400F $110Nvidia RTX 4070 $499Crucial T700 M.2 4TB $340
Today's hottest deals
If you buy something via a price link, UserBenchmark may earn a commission
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer  •  YouTube Feedback