SD card and microSD? Micro sd vs sdhc SD card and microSD memory comparison
SD card and microSD memory comparison? Launched in the mid 90s with the first Compact Flash , the memory cards have since changed significantly, both in terms of the format, standard or abilities. While finding a 8MB memory card was a feat in 1997, the cards with a capacity of 64 GB or 128 GB are now common and (relatively) affordable, to the delight of photographers and filmmakers. Memories of a larger size cards are even beginning to be available, unfortunately at even higher rates. SD card and microSD memory comparison
All the cards – and all formats – are not equal in terms of performance. Here is a buying guide to help you choose your (future) memory card with a capacity of 16 GB to 128 GB, as this is the format Secure Digital (SDHC / SDXC) or microSD . This month- , we take the opportunity to update our test bench.
Summary of the best memory cards (micro) SD of our comparative
Global Performance Index SD card and microSD memory comparison
|THE SD CARD FASTER||THE FASTEST MICROSD CARD||THE BEST CAPACITY / PRICE|
|Integral Ultima Pro X2 32GB (SDHC)||Samsung PRO Plus 64GB (microSDXC)||PNY High 128GB (microSDXC)|
|It is not really affordable but the Ultima Pro X2 32GB Integral’s fastest in our survey, and from far away. Admittedly, this card has a UHS-II interface, which is – at least partly – its excellent performance.Warning, these performances will be achievable only with a compatible reader UHS-II!||Significantly slower than the Integral Ultima Pro X2 32GB, the 64GB Samsung PRO Plus remains the fastest in our comparative microSDXC format. Its performance is homogeneous and relatively affordable.||Only model of our comparative to achieve such storage capacity, the PNY High Performance 128GB surprises especially as it is microSDXC format.This compactness however pay in performance, relatively low. Fortunately, the price per GB is reasonable.|
|SDXC, UHS-II||microSDXC, UHS-I||microSDXC, UHS-I|
|Class10, U3||Class10, U3||Class10, U1|
To place the Secure Digital memory cards to our selection, we had to develop an overall index performance: one is based on the results of each of the test patterns, taking into account the sequential read access performance and writing, but also random access (always reading and writing) and giving equal importance, ie “weight” to each of these parameters. The assembly is then reported as a percentage of the performance achieved by the fastest model, which gives us an overall score out of 100.
Our other comparisons: SD card and microSD memory comparison
|PRODUCTS MENTIONED IN THIS ARTICLE|
|Integral Ultima Pro X2 32GB (SDHC)||Amazon€ 122.93||SEE MORE|
|Samsung PRO + 64GB (microSDXC)||Amazon€ 47.99||SEE MORE|
|PNY High Performance 128GB (microSDXC)||Amazon€ 50.19||SEE MORE|
|Asus Z170-Deluxe||Amazon€ 289.99||SEE MORE|
|8GB DDR4-2133 KLEVV||Amazon€ 54.73||SEE MORE|
|Crucial MX200 500GB||Amazon€ 146.29||SEE MORE|
|SanDisk Extreme Pro (UHS-II)||Amazon€ 22.66||SEE MORE|
|Cooler Master G450M||Amazon€ 52.29||SEE MORE|
|PNY 64GB Elite (microSDXC)||Amazon€ 46.13||SEE MORE|
|Samsung PRO + 32 GB (SDHC)||Amazon€ 38.04||SEE MORE|
|Samsung EVO + 32GB (microSDHC)||Amazon€ 13.04||SEE MORE|
|Samsung EVO + 64GB (SDXC)||Amazon€ 24.91||SEE MORE|
|Sony SF-16UZ 16 GB (SDHC)||Amazon€ 32.99||SEE MORE|
|Sony SF-32UX2 32 GB (SDHC)||Amazon€ 26.66||SEE MORE|
|Sony SF-M64 64GB (SDXC)||Amazon€ 111.94||SEE MORE|
SD Memory Cards Begining: SD card and microSD memory comparison
The format Secure Digital (SD abbreviated form) has now imposed on the market. Lot of devices use SD cards as a storage medium, or any of its physical variants: Mini SD (almost disappeared) and MicroSD (formerly ” TransFlash “). Digital camera, via smartphones and tablets. The interface is identical, SD and microSD memory cards share the same characteristics.
The beginnings of the SD standard: SD card and microSD memory comparison
The original SD standard defined two versions of cards: SD 1.01 and SD 1.1. Both versions were working on 4 bits , but the first 25 MHz (12.5 MB / s maximum) and the second at 50 MHz ( 25 MB / s ). The theoretical maximum capacity was 4 GB, but in practice, the consortium that manages the SD imposed an official limit to 2GB, because of the constraints of the FAT16. However, there were cards with 4 GB formatted as FAT32, but was random compatibility with readers and devices.
SDHC and SDXC
In 2006, the cards SDHC ( SD 2.0 ) occurred. It is an adaptation of SD cards with high capacity (HC High Capacity). The interface itself is identical (and thus limited to 25 MB / s maximum), but how to address the data is different, allowing cards up to 32GB . SDHC cards, however, not be read with an old SD reader (increasingly rare these days).
In 2009, the standard SDXC ( SD eXtended Capacity , specifications SD 3.01 ) was born. It increases the capacity of cards to a theoretical maximum of 2TB . The bus UHS-I (always a 4-bit width) used by the first SDXC cards (and some SDHC cards) can reach a frequency of 208 MHz ( SDR104 ) or a maximum throughput of 104 MB / s. the modes SDR50 / DDR50 (50MB / s) SDR25 (25MB / s) and SDR12 (12.5 MB / s) are also available. As for compatible cards UHS-II as specified in the SD 4.0 standard, they can reach speeds of around 156 MB / s ( FD156 ) to 312 MB / s ( HD312 ). SDXC cards are however not compatible with the SD or SDHC readers previous standards.
The SD Association has defined several ” classes ” of speed, indicating the minimum write speed that the card is capable of supporting. A map Class 2 is for example able to offer sustained throughput writing of 2 MB / s, against 10 MB / s Class 10 UHS Speed Class or 1 (U1). A UHS Speed Class 3 (U3) will in turn ensure a sustained throughput of writing 30MB / s.
NAND flash memory
Like the SSD , memory cards using the NAND flash memory to store data . If the fastest cards use the NAND SLC (Single Layer Cell), the most compact models and densest do however call in memory MLC (Multi Layer Cell), capable of storing multiple bits into the same cell. This increase in storage capacity, equal to physical size, however, pay at the life (MLC flash memory is less endurance than SLC flash memory) and especially the performance (especially in writing).
Reads, write and Speeds
Let’s start with CrystalDiskMark sequential speeds and tests (reading and writing). This software for defining the length of the command queue, we tested different memory cards without queue (ie with a Q1 command queue length) and 32 orders in a queue (Q32) but still with a single thread. Unlike SSD, memory cards do not necessarily enjoy a long queue …
HD Tune confirms the excellent performance of Ultima Pro X2 Integral. The PNY High 128GB Samsung EVO and two more are distinguished by their low write performance. It is more relevant to measure IOPS random access rather than speed, whether reading or writing. Let us start by reading blocks access 4KB without queue and with a wait of 32 command line. No, it’s not a mistake, we started the test to be on: Sony SF-M64 64GB suffers indeed an access time of 75 ms in writing, where the most model Quick – the Samsung 64GB EVO More – display just 2 ms! For this particular model, HD Tune highlighted a great instability write performance (ranging from 0.1 Mb / s to 77 MB / s!), Which may explain the time to very high access ..
Tests and Benchmarks
AS SSD can test the performance of SSD in file copies. Three scenarios are possible depending on the type of data – non-compressible: copy ISO files (both large files of 500MB), file copy program (a type of directory “Program Files” with many small files) and copy set files (a mixture of various sizes of files). The whole gives an idea of the performance memories in real conditions cards, with a mix of reads and writes.