SLC Cache Size Determination (using Sequential Write to 90% of Disk Capacity) Combined together, we see that the Samsung Portable SSD X5 throttles more under heavy loading compared to some of the other Thunderbolt 3 SSDs in the market. In addition, the absence of additional surface area in the chassis to dissipate the heat (in the form of ridges or fins) is also a negative. The choice of magnesium compared to aluminum is puzzling (given that the thermal conductivity of aluminum and magnesium are 205 w/mK and 156 W/mK). The internal SSD temperature did go above the X5's (reached 57C at the end of our test), but, the passive-cooling friendly ridged aluminum enclosure managed to do an effective job.Ĭompared to the TEKQ Rapide, it does appear that the X5 chassis is unable to keep temperatures down without extensive throttling. On the other hand, our DIY configuration with the SanDisk Extreme Pro 1TB SSD in the TEKQ Rapide aluminum Thunderbolt 3 enclosure managed to pass the same test without any issues in less than 1/10th of the time taken by the X5 for the same amount of data. Write speeds often got down as low as 60 MBps.
We see that the thermal management scheme adopted by Samsung is very detrimental to long-running sequential write jobs (typical of first-time backups), despite managing to limit the internal SSD temperature to less than 56C. Sequential Write to 90% of Disk Capacity - Performance Consistency The internal temperature, instantaneous write data rate, and total amount of data written in total till that point of time were recorded. In order to figure out the impacts, I deleted the volume on the X5, and set up a fio workload to write sequential data to the raw drive with a block size of 128K and iodepth of 32 to cover 90% of the drive capacity. The 'Dynamic Thermal Guard' technology adopted by Samsung appeared interesting from the marketing description (automatic throttling to keep the case temperature below 45C). Miscellaneous Aspects and Concluding Remarks
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