![]() Micron’s replacement gate architecture combines both charge traps with the company’s CMOS-under array technology, allowing for a 30% smaller die size when compared to competitors’ flash. We went into detail about this new flash on our Phison PS5018-E18 preview, but for those who want the gist, instead of taking advantage of a floating gate architecture, the company’s B47R flash leverages a replacement gate architecture. This flash is different from that of the previous-generation that we’ve seen produced by Micron. There are two NAND packages on our 1TB sample, each crammed with eight 512Gb dies. Rated for interface speeds of up to 1,600 MTps, Micron’s B47R 176L TLC is some of the fastest NAND on the market. The main performance improvement behind the P5 Plus is the flash, however. ![]() You also get integrated power loss immunity due to the way Crucial programs the flash. It also sports NVMe autonomous power state transition (APST) and adaptive thermal protection that kicks in at a temperature of 80 degrees Celsius and hotter to protect data. The 500GB model and 1TB model utilize 1GB of DRAM, while the 2TB has 2GB. Regardless, the controller is still an 8-channel design that leverages LPDDR4 DRAM to accelerate FTL management. There is the possibility that the company has cut the number of cores or opted for a smaller process node to manufacture the controller, based on its lower heat output in relation to the P5. The controller is designed in-house, and we speculate that it is very similar to the six-core controller powering the P5, save for the new Gen4 PHY. But while in such a pivotal position, the company was less than forthright when it came time to open up about the hardware secrets behind the P5 Plus. Micron is one of the few vertically integrated SSD vendors. In terms of its performance, it’s rated to deliver sequential speeds of up to 6.6/5.0 GBps read/write and can manage upwards of 720,000/700,000 random read/write IOPS when tasked to full load, thanks to dynamic write acceleration (Crucial’s SLC caching implementation). Crucial’s P5 Plus comes in capacities of 500GB, 1TB, and 2TB and is priced aggressively low for a PCIe 4.0 SSD.
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