What microSD card should I buy for my Steam Deck and how much storage do I need?

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Let's cut through the noise on microSD cards for Steam Deck. With modern games hitting 100+ GB, you're almost definitely going to want extra storage—even on the 512GB model. Here's what actually matters when picking a card.

The Specs That Actually Matter

There are a ton of numbers on microSD card packaging. Here's what to pay attention to:

A2 rating: This is the big one. A2 means the card is optimized for apps and games, not just storing photos or video. You want this.

UHS-I U3: This guarantees at least 30MB/s write speed. Anything slower will cause stuttering when games try to load assets.

Read speed 100MB/s+: Higher is better for loading times, but you hit diminishing returns past 150MB/s on Steam Deck.

What to ignore: V30 ratings without A2 are designed for video cameras, not gaming. Marketing claims of "perfect for gaming" without these specs are meaningless.

My Actual Recommendations

If you want the best: SanDisk Extreme 512GB This is what most Steam Deck enthusiasts recommend, and for good reason. 190MB/s read speeds, A2 rated, and consistently reliable. Around $45–55 typically. This is what I'd buy.

If you want good value: Samsung EVO Select 512GB Slightly slower at 130MB/s reads, but noticeably cheaper than the Extreme. Still A2 rated, still reliable. A great choice if you're budget-conscious but don't want to compromise on quality.

If you need maximum storage: SanDisk Ultra 1TB When 512GB isn't enough. Slightly slower than the Extreme line, but 1TB is a LOT of games. The price per GB is actually quite reasonable at this capacity.

If you just need something decent: Samsung EVO Plus 256GB Entry-level capacity, entry-level price, but still performs well. Good for someone who doesn't need to install their entire Steam library at once.

How Much Storage Do You Really Need?

Let me put this in perspective with real game sizes:

• Cyberpunk 2077: 70GB
• Red Dead Redemption 2: 120GB
• Elden Ring: 50GB
• Baldur's Gate 3: 150GB
• Stardew Valley: 500MB

On a 512GB card, you might fit 4–5 big AAA games, OR you could install 50 indie games and still have room to spare. Most people end up with a mix of both.

Here's my recommendation: the 512GB Steam Deck OLED plus a 512GB microSD card gives you around 900GB total. That's usually plenty for most people's installed games plus room to download new stuff without constantly managing storage.

Internal Storage vs. MicroSD: Does It Matter?

Yes, but not as much as you'd think.

Loading times on a good microSD card are about 10–20% slower than internal storage. In practice? Maybe 5–10 extra seconds on a loading screen. For most games, you won't even notice.

My strategy:

• Competitive multiplayer games go on internal (every second counts)
• Story-driven single-player games go on microSD (who cares about extra seconds between chapters?)
• Indie games? Either works—they load fast regardless.

Setting It Up

Dead simple:

1. Insert the card in the slot on the bottom of your Deck
2. Go to Settings > System > Format SD Card
3. Wait about a minute
4. When downloading games, choose your preferred install location

You can also move games between internal and microSD storage later. It takes a while for big games, but it works.

Don't Get Scammed

This is important: counterfeit microSD cards are everywhere. That "1TB SanDisk" for $15 on a random marketplace? It's fake. It might show up as 1TB but actually be 8GB underneath—and you won't know until your games start corrupting.

Buy from:

• Amazon (sold by Amazon, not third-party sellers)
• Best Buy
• Direct from SanDisk or Samsung
• Other major retailers you trust

If the price seems too good to be true, it absolutely is.

My Bottom Line

Get a SanDisk Extreme 512GB. It hits the sweet spot of speed, capacity, and price. Combined with your internal storage, you'll have enough room to install a serious game library without constantly shuffling things around.

If you're patient enough to wait for sales, these cards go on discount during Amazon Prime Day, Black Friday, and random flash sales. I've seen the 512GB Extreme drop under $40 during good promotions.