SAMSUNG 850 PRO IN RAPID MODE
During our attendance last year at the Samsung SSD Summit in Seoul, South Korea, David Lin of former NVELO fame, now Samsung, introduced us to RAPID (Real Time Accelerated Processing of I/O Data). When enabled through the Samsung SSD Magician, RAPID uses spare DRAM as a cache in order to provide read acceleration and write optimization for a system level performance boost. At that time there was a cap of 1GB on the maximum memory size that could be used and we asked David why they didn’t increase this limit for those of us with 32 and even 64GB of memory in our systems. His response… “Wait for it.”
This years Samsung Magician Ver. 4.4 release contains a new and improved RAPID. Samsung has included a new DRAM usage algorithm that now allows for a maximum memory usage of 4GB when system memory in use is 25% or less. Last year, RAPID increased SSD performance to just over 1GB/s. Take a look at this years results and get ready for some massive cached speed…
An important note with this ATTO result is how unpredictable performance can be when using DRAM as a cache. Ideally, we like to see ATTO speeds gradually increase with file size.
With Crystal DiskMark, RAPID claims to reach speeds of over 7GB/s read and 4.5GB/s write, with a low 4K write score of 692MB/s. The true question will be how these speeds translate into real life transfer speeds.
As unbelievable as these are, we were definitely surprised with the AS SSD Copy Benchmark scores as this benchmark is a simple real life benchmark where three different files are moved from one part of the disk to another.
Last but not least, Anvil provides a complete picture of throughput and IOPS speeds.
When we look at RAPID performance as shown here, an understanding that these results are the product of our DRAM being used as a cache is necessary. This performance doesn’t create a new standard and shouldn’t be viewed as increasing ones PC performance more than tenfold, but rather, RAPID will provide benefits in specific scenarios. As for reliability, we have had one of our systems running RAPID for just over a year now and RAPID is still running strong. To sit at that system, and than any other in our office however, one could not visibly see any difference in ‘typical user activities’. Still, amazing number though eh?