Upgrading the internal SSD in your iMac 2015 is one of the smartest ways to breathe new life into your aging machine. Whether you’re dealing with slow boot times, sluggish app launches, or just running out of storage, swapping out the original hard drive or outdated SSD for a modern NVMe drive can dramatically improve performance. But with so many options on the market, finding the best internal SSD for iMac 2015 can be confusing. That’s why we’ve tested and compared the top-performing drives—factoring in speed, compatibility, ease of installation, and real-world reliability—to bring you this expert-curated list of the best upgrades available today.
Quick Product Comparison
Our Top 5 What Is The Best Internal Ssd For Imac 2015 Reviews – Expert Tested & Recommended
1. 1TB NVMe SSD for iMac 2015 with PCIe Gen3.0x4 and 2100MB/s Speed
This high-performance NVMe SSD delivers blazing-fast speeds and rock-solid reliability, making it our top pick for anyone looking to maximize their iMac 2015’s potential. With read speeds up to 2,100MB/s and write speeds hitting 1,700MB/s, it transforms boot times, file transfers, and overall system responsiveness.
Key Features That Stand Out
✓ PCIe Gen3.0 x4 interface for maximum bandwidth
✓ Advanced 3D NAND flash technology for durability
✓ MTBF over 1.5 million hours—built to last
✓ Shock-resistant design ideal for desktop use
✓ Plug-and-play compatibility with iMac 2015 (requires adapter or bracket)
Why We Recommend It
We love this SSD because it strikes the perfect balance between speed, capacity, and value. It’s not just fast—it’s also rigorously tested for long-term stability, which means fewer crashes and better peace of mind. If you want a future-proof upgrade that feels like a brand-new machine, this is it.
Best For
Power users, content creators, and anyone who wants the fastest possible performance from their iMac 2015 without breaking the bank.
Pros and Cons
Pros:
- Exceptional read/write speeds
- High endurance and reliability
- 1TB capacity offers ample storage
- Compatible with multiple Mac models
Cons:
- Requires separate mounting bracket or adapter
- No included installation tools
Customer Reviews
Customer Review: “Installed this in my late-2015 iMac and the difference is night and day. Boot time went from over a minute to under 15 seconds. Highly recommend!” – Jason T.
Customer Review: “Great speed and no issues after 6 months of heavy use. Just make sure you get the right adapter—this drive doesn’t come with one.” – Lisa M.
2. 1TB OWC SSD Upgrade Kit for iMac 2012-2015 with Tools and Bracket
OWC has long been a trusted name in Mac upgrades, and this complete kit makes swapping your iMac’s drive easier than ever. It includes everything you need—SSD, mounting bracket, screws, and even a USB enclosure for cloning your old drive.
Key Features That Stand Out
✓ Complete DIY kit with all necessary tools
✓ Includes USB-to-SATA adapter for easy cloning
✓ Sequential read speeds up to 532MB/s
✓ Designed specifically for 27″ iMacs (2012–2015)
✓ No software hacks or firmware tweaks required
Why We Recommend It
What sets this apart is the thoughtful packaging and Mac-specific engineering. OWC knows Apple hardware inside and out, so compatibility is guaranteed. The included tools and clear instructions make this ideal for first-time upgraders who don’t want to risk damaging their iMac.
Best For
Users who want a hassle-free, all-in-one solution with reliable support and no guesswork involved.
Pros and Cons
Pros:
- Everything included—no extra purchases needed
- Excellent customer support and warranty
- Proven compatibility with iMac 2015
- Easy cloning process via USB enclosure
Cons:
- Slower than NVMe options (SATA-based)
- Higher price point due to bundled accessories
Customer Reviews
Customer Review: “I have to admit from the outset that I am a technical fool. This is fully proved by me purchasing the OWC SSD Upgrade Bundle in the first instance! I own a 27” iMac late 2013 and noticed how the impressive speeds have slowed down over the years.” – David R.
Customer Review: “So my iMac had been having trouble just randomly restarting and finally wouldn’t boot back up. What to do??? Saw this replacement kit and thought I’d give it a try and see if I could resurrect my iMac. Full disclosure, I failed to double check the size of my machine and I ordered the kit for 27” and…” – Sarah K.
3. 512GB NVMe SSD for iMac 2015 with PCIe Gen3.0x4 and High Speed
If you’re looking for a budget-friendly NVMe upgrade that still delivers serious speed, this 512GB drive is an excellent choice. It offers near-flagship performance at a fraction of the cost, making it perfect for everyday users who want a noticeable boost without overspending.
Key Features That Stand Out
✓ PCIe Gen3.0 x4 interface with up to 2,100MB/s read speed
✓ 3D NAND flash for improved efficiency and longevity
✓ Low power consumption and silent operation
✓ Rigorous testing ensures high reliability
✓ Compact M.2 form factor (requires adapter for iMac)
Why We Recommend It
For under $100, this SSD gives you NVMe-level performance that blows traditional SATA drives out of the water. It’s not as spacious as the 1TB models, but for most users, 512GB is plenty—and the speed gain is undeniable.
Best For
Casual users, students, or anyone on a tight budget who still wants a meaningful performance upgrade.
Pros and Cons
Pros:
- Outstanding value for money
- Fast NVMe speeds
- Energy-efficient and durable
- Works with multiple Mac models
Cons:
- Only 512GB—may fill up quickly with large files
- No included mounting hardware or tools
Customer Reviews
Customer Review: “I purchased this OSCOO 1TB NVMe SSD because my original drive failed, and my MacBook wouldn’t boot up — it was completely dead in the water. I figured I’d give this replacement a shot and also get an upgrade in storage and speed, and I’m so glad I did. PRO TIP: READ THE USER MANUAL! I almost returned…” – Mike L.
Customer Review: “Installed fine in my 2013 mac pro. I formatted it and installed open core legacy patcher. I have so much space now.” – Alex P.
4. 1TB Internal SSD for MacBook Air and Pro 2013-2017 with PCIe Gen3x4
Though marketed for MacBook Air and Pro, this versatile SSD also works in compatible iMac 2015 models with the right adapter. It comes pre-installed with macOS High Sierra, so you can boot immediately after installation—no need to reinstall the OS.
Key Features That Stand Out
✓ Pre-installed macOS High Sierra (10.13)
✓ PCIe Gen3 x4 interface for fast data transfer
✓ 1TB capacity for ample storage
✓ Compatible with multiple Mac models (check EMC numbers)
✓ Plug-and-play setup
Why We Recommend It
The pre-loaded OS is a huge time-saver, especially if your iMac won’t boot. Just swap the drive, and you’re ready to go. It’s a great option if you’re restoring an old machine or setting up a secondary system.
Best For
Users restoring a dead iMac or those who want a quick, no-fuss upgrade with macOS already installed.
Pros and Cons
Pros:
- MacOS pre-installed—no reinstallation needed
- Large 1TB capacity
- Good compatibility across Mac models
- Solid build quality
Cons:
- Requires careful model matching (EMC numbers)
- Limited speed compared to newer NVMe drives
Customer Reviews
Customer Review: “Fixing up a salvaged Macbook. Had a suspicion it was the SSD. Works great, now.” – Chris W.
Customer Review: “Used on old 2015 MacBook. Worked perfectly.” – Emma R.
5. FM13A 512GB PCIe NVMe SSD with DIY Tools for MacBook Air A1465 A1466 , MacBook Pro Retina A1398 A…
This SSD stands out for including high-quality DIY tools and a bootable USB drive—making it one of the most user-friendly upgrade kits available. With read speeds up to 1,850MB/s, it delivers serious performance for the price.
Key Features That Stand Out
✓ Includes premium screwdrivers and spudgers
✓ Bootable USB thumb drive included
✓ Read speeds up to 1,850MB/s, write up to 1,450MB/s
✓ Pre-formatted and ready to install
✓ Compatible with iMac 2015 (via adapter)
Why We Recommend It
The inclusion of tools and a recovery drive removes the biggest barrier to DIY upgrades: fear of not having the right gear. This kit makes the process accessible even for beginners, while still offering pro-level speed.
Best For
First-time upgraders or anyone who wants a complete toolkit along with their new SSD.
Pros and Cons
Pros:
- All-in-one kit with tools and USB drive
- Fast NVMe performance
- Pre-formatted for easy installation
- Great customer support
Cons:
- 512GB may be limiting for media-heavy users
- Requires macOS 10.13 or later
Customer Reviews
Customer Review: “It worked just as advertised fast speed, and it has the operating system installed already, which makes it easy very easy to install inside the computer.” – Ryan H.
Customer Review: “I was in a rush since the SSD in my old mid-2015 MacPro died, so I didn’t notice the third photo down in the seller’s description. But this SSD comes pre-formatted AND comes with a high-quality boot USB thumb drive. These extras saved a huge amount of time. Most importantly, the new replacement SSD w…” – Jordan T.
Complete Buying Guide for What Is The Best Internal SSD For Imac 2015
Essential Factors We Consider
When choosing the best internal SSD for iMac 2015, we evaluate several key factors: compatibility (not all NVMe drives work without adapters), speed (PCIe Gen3 x4 is ideal), capacity (512GB–1TB recommended), ease of installation (kits with tools score higher), and real-world reliability based on user feedback and testing. We also prioritize drives that don’t require firmware hacks or third-party software to function properly in macOS.
Budget Planning
Prices range from around $70 for budget 512GB NVMe drives to over $200 for premium kits like OWC’s all-in-one bundle. If you’re on a tight budget, the 512GB NVMe option offers the best bang for your buck. For those who want maximum convenience and support, spending extra on a complete kit is worth it. Always factor in the cost of adapters or tools if they’re not included.
Final Thoughts
Upgrading your iMac 2015’s SSD is one of the most impactful improvements you can make. Whether you choose our Best Choice NVMe drive for raw speed or the Editor’s Choice OWC kit for hassle-free installation, you’ll notice immediate gains in responsiveness and usability. Don’t let an aging hard drive hold back your productivity—make the switch today!
Frequently Asked Questions
Q: Can I install an NVMe SSD directly into my iMac 2015?
A: The iMac 2015 uses a proprietary Apple SSD connector, so most standard M.2 NVMe drives require an adapter or bracket to fit. Always check compatibility before buying.
Q: Do I need to reinstall macOS after upgrading?
A: Not necessarily. Some SSDs come pre-loaded with macOS, while others require you to clone your old drive or reinstall via Recovery Mode. Kits with USB enclosures make cloning easy.
Q: Will upgrading my SSD void my warranty?
A: Since the iMac 2015 is no longer under Apple’s standard warranty, upgrading won’t affect coverage. However, always back up your data before starting any hardware modification.
Q: What’s the difference between SATA and NVMe SSDs for iMac 2015?
A: NVMe drives are significantly faster (up to 2,100MB/s vs. ~550MB/s for SATA). However, SATA-based kits like OWC’s often include everything needed for installation, making them more beginner-friendly.
Q: How much storage do I really need?
A: For general use, 512GB is sufficient. If you work with large files (video, photos, games), go for 1TB or more. Remember, you can always use external drives for extra space.
Ready to supercharge your iMac 2015? Click any “Check Price” button above to grab your preferred SSD and enjoy lightning-fast performance in just a few hours. Your future self will thank you!