SanDisk Optimus GX 7100

The Optimus GX 7100 hits 1200K random write IOPS, putting it in the 95th percentile of all drives we've tested. Sequential reads at 6800 MB/s are top-tier for PCIe 4.0, and users rate it 4.8 out of 5 stars. The 500GB capacity is the weak link, sitting in the 24th percentile, so this is a boot drive or a home for a few favorite games, not a full library.

Let's talk numbers. The 6800 MB/s sequential read speed puts this drive in the 90th percentile of everything in our database. That's fast enough to load games, transfer large files, and keep Windows feeling snappy without breaking a sweat. The 5800 MB/s write speed is no slouch either, though it's worth noting the 1TB and 2TB models push up to 7250 MB/s read and 6900 MB/s write, so the 500GB version leaves some performance on the table.

The random performance is where this drive really flexes. 1200K random write IOPS is a top-of-the-charts result, and 760K random read IOPS is nothing to sneeze at. SanDisk's nCache technology helps here, using a portion of the TLC NAND as an SLC cache to absorb burst writes. Being DRAM-less usually hurts random performance, but SanDisk clearly tuned the firmware well. For DirectStorage games and general responsiveness, this drive punches above its weight class.

Against the Samsung 990 PRO, the Optimus GX 7100 holds its own on random writes but gives up ground on sequential reads and overall consistency. The 990 PRO is simply a more polished drive with DRAM and better sustained performance. The WD_BLACK SN7100 is a closer match, both being DRAM-less designs aimed at gamers, but the SN7100 typically offers better sequential speeds at similar price points. The Crucial T710 and ADATA GAMMIX S70 Blade both bring DRAM caches and higher capacities to the table, which matters if you're storing more than a handful of games. The Silicon Power XS70 is the budget wildcard here, often undercutting everyone on price while delivering comparable Gen 4 speeds. Where the Optimus GX 7100 wins is that random write IOPS figure, it's genuinely best-in-class for this tier.

Pricing on this drive is all over the place depending on where you shop. In the US, you're looking at USD 120 to USD 132 across three listings, a USD 12 spread that's worth paying attention to. Best Buy has the lowest everyday price in that range, so if you're buying stateside, that's where we'd point you. European buyers face a EUR 14 gap between EUR 123 and EUR 137 across four listings in Germany, Spain, France, and Italy. For a 500GB PCIe 4.0 drive with this level of random performance, the lower end of those ranges feels fair. At the higher end, you're creeping into territory where 1TB drives from competitors start looking tempting.

The SanDisk Optimus GX 7100 lands in the 90th percentile for speed in our database, which puts it ahead of most PCIe 4.0 drives we've tested. The 500GB model we're looking at delivers 6800 MB/s sequential reads and 5800 MB/s writes, with random performance hitting 760K read IOPS and 1200K write IOPS. That random write number is the real standout here, sitting in the 95th percentile overall. For a DRAM-less drive, those are seriously respectable figures.

But there's a catch. The 500GB capacity puts this drive in the 24th percentile for storage space, which is rough when modern games routinely eat 100GB or more. The endurance rating of 300 TBW is solid for the size, landing in the 88th percentile, and the 5-year warranty backs that up. Users seem genuinely happy with this thing, with a 4.8 out of 5 rating across 29 reviews and an 88/100 sentiment score. The main complaint isn't even about the drive itself, it's about Geek Squad taking forever to install one.

If you're building a gaming PC and want your entire Steam library on one drive, look elsewhere. The 500GB capacity sits in the 24th percentile, which means you'll fit maybe four or five modern AAA games before you're juggling uninstalls. The feature set is also middle of the pack at the 53rd percentile, so there's nothing special here beyond raw speed. And if you're shopping in the US, paying USD 132 when the same drive is available for USD 120 at Best Buy is just leaving money on the table. For the same budget, a 1TB drive from Silicon Power or ADATA gives you double the space with comparable Gen 4 performance.

The SanDisk Optimus GX 7100 is a fast, reliable PCIe 4.0 drive that excels at random writes and runs cool under pressure. The 500GB capacity is the real limitation here, and at USD 120 to USD 132, you're paying a premium for the SanDisk name when larger drives from competitors aren't much more. That said, the 4.8/5 user rating and 88/100 sentiment score tell us owners are happy with what they got. If you need a dependable boot drive or a secondary drive for a few key games, this one delivers. If you're building a game library, step up to the 1TB or 2TB version, or look at the WD_BLACK SN7100 for more space per dollar.