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It seems that Valve had incorrect details on the specification sheet for the Steam Deck, and as a result we now know the RAM is more impressive.

Originally (as seen on the Web Archive), Valve listed the Steam Deck as having "5500 MT/s dual-channel" which they've now adjusted to say it's actually "5500 MT/s quad 32-bit channels". Thanks to that, we know that the Steam Deck should perform even better than we originally thought it would. The speed may not have changed, but dual to quad is still a pretty nice boost.

We've known for some time now that RAM speed and bandwidth is important to Ryzen CPUs, so this is quite an important clarification to come from Valve. For such a small (relatively speaking) device, every little bit of possible performance is going to be vital, especially since likely the majority of games will end up being played using the Steam Play Proton compatibility tool.

Additionally, Valve designer Lawrence Yang has clarified that when the Steam Deck was recently shown off to IGN the games were actually being played from an SD Card:

Yep, games will load faster off internal storage, but games still play great off an SD card. When IGN came by, all the games they tried (and shot footage of) were played off a microSD card.

Yang also confirmed on Twitter that when docked you can run Steam Deck games off of an external SSD.

Article taken from
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TheRiddick 21 Jul
I bought a 180MB/s 512GB mSD card the other day, hopefully it will be decent. Might need a SD reader that can support that speed however.

You can get microSD cards up to 300MB/s but price climbs allot, and storage space can be reduced as I presume their getting better speed via dual/quad write methods.
mahagr 21 Jul
Now I just want to know whether the 7" screen supports variable refresh rate.. If it does, it really starts to look like a dream handheld.
Eike 21 Jul
I think I haven't seen it mentioned here yet: All Steam Decks got an M.2 slot for short (M.2230) SSDs. In the smallest variant, it's empty. I cannot say how accessible it is, though.

Last edited by Eike on 21 July 2021 at 9:32 am UTC
Eike 21 Jul
Quoting: mahagrNow I just want to know whether the 7" screen supports variable refresh rate.. If it does, it really starts to look like a dream handheld.

I wouldn't think so. Sounds like some extra complication. (Though I do think there will be a time when we'll wonder why not everything on a computer had variable refresh rate decades earlier. :D )
damarrin 21 Jul
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Yeah, the information about the m.2 sockets is also new, it wasn't there before. As for not being user-accessible, I'm guessing it means you need to open the deck up to access it and it'll void your warranty.
Corben 21 Jul
A feature that allows to import and/or exchange library folders without restarting the Steam client is now kind of mandatory.
You might have several SD cards holding libraries, or when docking you want to have the external storage accessible immediately to make it a smooth experience.

Gosh, I. can. not. wait. :D
mirv 21 Jul
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You'll need a decent sdcard as well. Not all sdcards are created equally. I have some of the higher performance ones for a DSLR purely to write out the RAW images as fast as possible.

Naturally technology improves, so the pricing on such things has come down even from where it was a few years ago, but something to keep in mind regardless.

Actually the ability to mount and run games from external sources is something that the normal client could benefit from greatly. I'd be much tempted to backup as much as possible if it were easier to do that. One of my criticisms of Steam is that you can't roll back games if an update breaks them.
TheRiddick 21 Jul
Quoting: damarrinI'm guessing it means you need to open the deck up to access it and it'll void your warranty.

Invalid here in Australia, we are allowed to open electronics up. (stores will fight, then you show them the law and they shut up)

80-90MB/s is the typical MicroSD cards sold and also Nintendo ones. I bought a 512GB 180MB/s R/W one however so hopefully that will be a little bit faster. (faster ones cost more)

Last edited by TheRiddick on 21 July 2021 at 9:51 am UTC
TheRiddick 21 Jul
Rust needs EAC support via proton, so runs, yes mostly (its possible to bug out the prefix and get infinite crashes on launch). No multiplayer however except for the hidden non-EAC servers nobody wants to play on. (no players or errors on connecting)
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