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For the RX100 III, buy a full-size SDXC card before chasing headline transfer speeds. Sony’s Help Guide says the camera accepts SD, SDHC, and SDXC cards, and says XAVC S recording needs an SDXC card of at least 64 GB that is Class 10 or faster and UHS-I compatible. That makes a 128 GB full-size UHS-I SDXC card a straightforward fit for stills and XAVC S Full HD. UHS-II cards remain electrically compatible SDXC media, but the RX100 III uses UHS-I, so their second row of contacts does not make the camera write faster. Avoid microSD listings unless you deliberately want an adapter; the cards below are full-size SD models. Format a newly purchased card in the camera after copying any files off it.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | SanDisk Extreme PRO SDSDXXD-128G-GN4IN | $69.98 per 128 GB card | Amazon · eBay |
| 2 | Lexar Professional SILVER PLUS LSDSIPL128G-BNNNU | $58.99 per 128 GB card | Amazon · eBay |
| 3 | Samsung PRO Plus MB-SD128KB/AM | $29.99 per 128 GB card | Amazon · eBay |
| 4 | Kingston Canvas Go! Plus SDG4/128GB | $63.39 per 128 GB card | Amazon · eBay |
| 5 | Transcend 300S TS128GSDC300S | $39.99 per 128 GB card | Amazon · eBay |
| 6 | ProGrade Digital V60 Gold PGSD128GBKNA | $129.99 per 128 GB card | Amazon · eBay |
| 7 | Delkin Devices POWER V90 DDSDG2000128 | $152.99 per 128 GB card | Amazon |
| 8 | Sony TOUGH-M SFM128T/T1 | $188 per 128 GB card | Amazon · eBay |
The picks, in detail
SanDisk Extreme PRO SDSDXXD-128G-GN4IN
Choose this SanDisk only if the current 128 GB SDSDXXD-128G-GN4IN listing is the price you accept. Its UHS-I and V30 markings meet Sony’s XAVC S media guidance, while the quoted 200 MB/s transfer figure matters mainly when using a compatible reader rather than inside the RX100 III.
- Extreme PRO: 200 MB/s read, 90 MB/s write
- 90 MB/s stated write
- U3/V30 video-class markings
- 128 GB SDSDXXD-128G-GN4IN SDXC
- V30/U3 classification directly maps to the camera’s XAVC S media requirement
- Exact current full-size model price is published
- Premium UHS-I transfer specification does not make the RX100 III UHS-II
- Price is far above basic cards that meet Sony’s requirement
Lexar Professional SILVER PLUS LSDSIPL128G-BNNNU
Lexar SILVER PLUS LSDSIPL128G-BNNNU is a full-size UHS-I card with a V30 designation and published 255 MB/s read, 180 MB/s write figures. It meets the RX100 III’s 64 GB-or-larger UHS-I SDXC XAVC S requirement; its fastest transfer claims are for a suitable reader, not evidence of a faster camera slot.
- 255 MB/s stated read
- 180 MB/s stated write
- Lexar V30 card with U3 class
- SKU LSDSIPL128G-BNNNU, 128 GB
- Published 180 MB/s write figure exceeds the camera’s 50 Mbps video rate
- Best Buy lists the exact full-size SKU
- 255/180 MB/s figures depend on a suitable card reader
- Current price is high for a UHS-I card
Samsung PRO Plus MB-SD128KB/AM
Samsung’s MB-SD128KB/AM is the PRO Plus package that includes a reader. It is a full-size 128 GB UHS-I SDXC card, so it fits the RX100 III directly and meets the format requirement for XAVC S. The bundled reader is the distinction for a photographer who also needs a desktop transfer path.
- 160 MB/s read and 120 MB/s write
- Samsung full-size UHS-I model MB-SD128KB/AM
- 128 GB PRO Plus capacity
- Reader included in this package
- Includes a card reader in this exact package
- Samsung identifies it as full-size SDXC
- Included reader may be redundant if one is already owned
- This SKU showed notify-me status at Samsung
Kingston Canvas Go! Plus SDG4/128GB
Kingston Canvas Go! Plus SDG4/128GB is a full-size 128 GB UHS-I card marked U3 and V30. Those markings are more relevant to the RX100 III than headline reader speed: Sony requires SDXC 64 GB or larger and UHS-I compatibility for XAVC S. Its current price is unusually high, so compare exact capacity and SKU.
- Canvas Go! Plus: 200 MB/s specified read
- Full-size UHS-I U3/V30 SDXC
- 128 GB SDG4/128GB capacity
- Canvas Go! Plus generation
- U3 and V30 marks are printed in the exact model listing
- Canvas Go! Plus is a full-size card, no adapter needed
- UHS-I interface cannot unlock UHS-II transfers
- Full-size card is pricier than its earlier generation
Transcend 300S TS128GSDC300S
Transcend’s TS128GSDC300S is the 128 GB 300S full-size SDXC model. Its stated 95 MB/s read speed is lower than newer premium cards, but Sony’s RX100 III requires capacity, Class 10-or-faster, and UHS-I compatibility for XAVC S rather than UHS-II transfer bandwidth.
- Model TS128GSDC300S
- 95 MB/s stated read
- Transcend 300S full-size UHS-I interface
- 128 GB TS128GSDC300S capacity
- Specific 300S SKU avoids confusing it with Transcend microSD products
- Walmart lists its 128 GB full-size configuration
- 95 MB/s read is slower for off-camera transfers
- No V30 mark is shown in the current Walmart summary
ProGrade Digital V60 Gold PGSD128GBKNA
ProGrade’s PGSD128GBKNA is a UHS-II V60 card with higher sustained-write classification than the RX100 III needs. It remains an SDXC option, but the camera only uses UHS-I bus capability. Buy it when the same card will also be used in a UHS-II body or reader, not to accelerate this compact camera alone.
- Model PGSD128GBKNA
- UHS-II and V60 rating
- 128 GB Gold-series SDXC
- 250 MB/s read and 130 MB/s write stated
- V60 certification is useful in a future higher-bandwidth camera
- Exact PGSD128GBKNA listing is in stock
- RX100 III cannot exploit its UHS-II bus
- V60 cost is difficult to justify for 50 Mbps XAVC S
Delkin Devices POWER V90 DDSDG2000128
Delkin POWER DDSDG2000128 is a 128 GB UHS-II V90 professional card. Its 90 MB/s minimum-write class exceeds the RX100 III’s stated XAVC S requirement, while the camera still communicates at UHS-I. It is the rugged, high-cost choice only when another UHS-II camera or demanding workflow will share the card.
- Model DDSDG2000128
- UHS-II and V90 rating
- 128 GB POWER-series SDXC
- 300 MB/s read and 250 MB/s write stated
- V90 minimum write class has a published 90 MB/s floor
- Delkin lists 300/250 MB/s maximum read/write figures
- V90 is excessive for this camera’s 50 Mbps XAVC S mode
- $152.99 price is several times a compatible UHS-I card
Sony TOUGH-M SFM128T/T1
Sony TOUGH-M SFM128T/T1 is a 128 GB UHS-II card with a ribless, weather-resistant design and stated IPX8/IPX6 ratings. It will fit the RX100 III as SDXC media, but its UHS-II speed and $188 price bring no in-camera bus-speed benefit on this UHS-I compact.
- Model SFM128T/T1
- UHS-II 128 GB SDXC
- 277 MB/s read and 150 MB/s write stated
- IPX8 water and IPX6 dust ratings stated
- Ribless body and stated ingress ratings distinguish it from ordinary SD cards
- Best Buy lists the exact SFM128T/T1 model
- UHS-II transfer performance is unused by RX100 III
- The $188 current price is the highest in this list
Buying tips
- Use a full-size SD card in the RX100 III slot; do not mistake a microSD listing with an adapter for the same product.
- For XAVC S, Sony specifies SDXC capacity of at least 64 GB and Class 10-or-faster/UHS-I-compatible media.
- A UHS-II card is compatible as SDXC media but cannot make the RX100 III operate at UHS-II bus speed.
- Compare exact 128 GB SKU and whether a reader is included before comparing prices.
- Format a new card in the RX100 III after backing up any existing files; formatting erases the card.
- Carry a second card for travel rather than relying on one very large card for every shoot.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.