How prices per GB are computed
The price on the box says little about what memory costs. A 64 GB card at $9 is cheaper per gigabyte than a 32 GB card at $6, and a two-module kit is easy to count twice. This site turns every Amazon RAM, memory-card and USB-stick listing into the price of the same thing — one gigabyte of the capacity the label states — and ranks by that.
The price column
Every category is quoted per GB. RAM, memory cards and USB sticks are never ranked against each other, and neither are the categories within them: a DDR4 module does not fit a DDR5 board, and a CFexpress card does not fit an SD slot.
| Kind | Categories | Speed column | Example |
|---|---|---|---|
| RAM | DDR5, DDR4, DDR3, server memory (ECC) | MT/s | $95.99 for 32 GB (2 × 16 GB) = $3.00 per GB |
| Memory cards | microSD, SD, CFexpress Type A, CFexpress Type B | read MB/s | $24.99 for 256 GB = $0.098 per GB |
| USB sticks | USB flash drives | read MB/s | $17.99 for 2 × 128 GB = $0.070 per GB |
Decimal gigabytes, as the label says
Capacities are taken as printed: 1 TB = 1,000 GB, and the French Go and To are GB and TB. Nothing is converted to binary units. Your computer will show a 128 GB card as about 119 GiB, less after formatting; every product loses the same share, so the ranking holds. A listing that states its capacity only in MB is listed by package price, without a price per GB.
Kits and packs: every gigabyte counted once
A RAM kit is priced over its total: “32GB (2x16GB)” is 32 GB, never 64. Where a title’s kit and its stated total disagree (“64GB (2x16GB)”), the kit wins and the price is marked ~. A RAM title that names only a total and a kit count (“32GB … Kit of 2”) is 32 GB in two modules. Packs of cards and sticks multiply: “5 Pack 64GB” is 320 GB. A stick with two plugs (USB-A and USB-C) is one stick.
The Speed column and the highlights
Speed is the rated maximum the listing states, in the category’s own unit: MT/s for RAM (the “MHz” of the box; a module name such as PC4-25600 means 3200), read MB/s for cards and sticks (the “up to” figure). It is shown beside the price and never changes the ranking. Best value marks the lowest price per GB among in-stock listings in the selected category that match your filters, across all result pages; Fastest marks the highest rated speed. Tied winners share the highlight, and a lone listing gets no badge. Write speeds, CAS latency and speed classes (V30, U3, A2) are in each row’s details; speed bins and classes are also the subtypes you can filter by.
What is estimated, and what never is
A capacity is never invented. A listing without one, or with several different capacities in its title, is listed by package price. Two things make a price an estimate, marked ~ and removed by “Hide estimates”: a module or card count that rests on a bare “x2”, and a kit that contradicts its stated total.
Never estimated:
- a capacity from a model or part number — only a number next to GB or TB counts;
- a speed from an interface — USB 3.2, UHS-II or PCIe say what the port can do, not the stick or card;
- a RAM speed read as a capacity — “DDR5 5600” and “3200MHz” are speeds;
- a capacity in MB — old cards keep their package price only.
Counterfeit cards and implausible prices
Fake memory cards and USB sticks that report a larger capacity than they hold are sold on every marketplace. A price per GB far below the market (“2 TB for €9”) is treated as a misread or a counterfeit and is not ranked; the same goes for prices far above it. That catches the obvious cases, not every one: buy from the manufacturer’s own store or a seller you trust, and test a new card’s full capacity before you fill it with photos.
What is not listed
SSDs, NVMe and M.2 drives and hard disks are out of scope. Card readers, adapters, hubs, cases, RAM coolers, motherboards, computers and phones are never listed, even when their titles name a capacity.
Where the numbers come from
Capacities, counts and speeds are read from the listing itself: the title (“Corsair Vengeance DDR5 32GB (2x16GB) 6000MHz CL30” → 2 × 16 GB at 6000 MT/s), and, where the product page has been read, the description and product information. Every number read from a product page must come with the exact words it was read from, or it is dropped.
Data freshness & countries
Prices are refreshed weekly for each of ten Amazon storefronts, each a separate catalog in its own currency; the date above the table shows the last update. Prices and availability change at any time — what Amazon shows at checkout is what applies.
Affiliate disclosure
Product links carry an Amazon Associates tag. As an Amazon Associate, this site earns from qualifying purchases, at no extra cost to you. Rankings are computed from the numbers alone and are never sponsored.
Compatibility is your check
The cheapest gigabyte is only a bargain if it works in your device. DDR3, DDR4 and DDR5 are not interchangeable; desktop DIMMs and laptop SO-DIMMs differ in size; boards list the kits they were tested with (the qualified vendor list). Cameras state the card type and speed class they need for video (V30, V60, V90). Check your device’s manual or ask the seller before you buy.