Lenovo Flex 5 15 review: A convertible with concessions

It has the look of a Yoga 720 15, but it costs hundreds less. Is the Flex 5 15 worth the savings?

When it comes to convertible laptops from Lenovo, the Yoga 720 15, which we reviewed, is one of our favorites. The dedicated GPU, the slim build, and the stellar performance pushed it to an almost-perfect score. The Flex 5 15 from Lenovo is also a convertible laptop, and it shares many design aspects with the Yoga 720, but with a catch; it's significantly cheaper. There are concessions made to keep the price down, but overall, it might be worth saving the extra money.

Let's take a close look at the Flex 5 15 to determine how it fares against not only the Yoga 720 15, but also the rest of the competitive 15-inch laptop market.

About this review

Lenovo supplied Windows Central with a review unit of the 15.6-inch Flex 5. This specific configuration has an Intel Core i7-7500U processor (CPU), 8GB of DDR4-2133 RAM, a 256GB PCIe solid-state drive (SSD), and a dedicated NVIDIA GeForce 940MX graphics card (GPU) with 2GB of GDDR5 VRAM. This specific configuration starts at about $850.

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As reviewed

Lenovo Flex 5 15 hardware and specs

Here are the exact specs of the Lenovo Flex 5 15 we received for review.

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ProcessorIntel Core i7-7500U (up to 3.50GHz)Dual-core
Storage256GB PCIe SSD(Samsung MZVLW256)
Display15.6-inch FHD (1920 x 1080)IPS, anti-glare (glossy)
GraphicsIntel HD Graphics 620NVIDIA GeForce 940MX with 2GB GDDR5 VRAM
PortsTwo USB-A 3.0USB-C 3.0HDMI 1.43.5mm jack4-in-1 card reader
SpeakersTwo 1.5W Harman speakersDolby Audio Premium
WirelessQualcomm Atheros QCA61x4A802.11ac (2 x 2)Bluetooth 4.1
CameraFront-facing 720p
BiometricsFingerprint reader for Windows Hello
BatteryThree cell 52.5WHr
Weight4.4 lbs (1.99 kg)
Dimensions14.33 inches x 9.72 inches x 0.75 inches364 mm x 247 mm x 19 mm
ColorOnyx black
PriceAbout $850

Something familiar

Lenovo Flex 5 15 design

When first unwrapping this laptop, you'd be easily tricked into thinking it's a Yoga 720. The color is nearly the same — here it's called Onyx black — and the dimensions are different by a few mere millimeters. The weight, at 4.4 lbs, is also identical.

The lid of the chassis is made from a poly and glass fiber hybrid, and the bottom is made from a PC/ABS plastic hybrid. The material does show some fingerprints and smudges, but they're easily taken care of with a regular wipe down. The chassis feels solid when you pick it up, and when twisted there is minimal movement and creaking.

The dual hinges here are a bit smaller than the ones found on the Yoga 720. In a shake test (which mimics the use of the laptop in a moving vehicle), there is a bit of movement in the lid that could get annoying if you're trying to be productive and travel at the same time.

The edges of the bottom chassis have a machined look with a silver accent that offsets the otherwise black color of the laptop. The same machined edges are found around the touchpad and the fingerprint reader, which is set into the palm rest just below the right edge of the keyboard. When typing, the fingerprint reader is offset enough so that it doesn't come into contact with your palm.

We have on the right side a 4-in-1 card reader for easy transfer of multimedia files, as well as a USB-A 3.0 port. The power button can also be found on the right side of the laptop. When in tablet mode, the power button definitely gets in the way until you learn to avoid it; there were plenty of times I hit it accidentally and had to wait for the PC to cycle from sleep mode. It's a minor annoyance.

The left side of the laptop houses an HDMI 1.4 port, another USB-A 3.0 port, and a USB-C 3.0 port. There's also a 3.5mm jack for headphones when you aren't listening to the dual speakers. In testing, the speakers reached an acceptably loud volume and remained clear. They are down-firing, so there's a bit of muffling when in your lap or on a table.

You shouldn't have a problem using all ports at once on the right side, but, depending on the size of the peripheral plugged into the USB-A and HDMI ports on the left side, things could get a bit crowded.

Suffering in the sun

Lenovo Flex 5 15 display

Lenovo's dim screen strikes again. Even at full brightness, you'll want to crank it up quite a bit more if there's any sort of bright lighting around you. The glossy finish on the display doesn't help with glare, either. Despite the problems with brightness, using the 15.6-inch display, especially in tablet mode, is satisfactory, and the touch function works as it should.

Testing the color accuracy reveals just 65 percent sRGB and 49 percent AdobeRGB, which is pretty low compared to many other laptops we've tested. This is a measurement of how well colors are reproduced, so you won't be mistaken if you feel the 1080p display is still quite striking.

The bezels along the sides of the display are slim, but it measures a bit thicker along the top. There's more than enough room for a front-facing, 720p webcam. Overall, it's clear that the display took part of the hit that's kept the price down. Still, if it were a bit brighter, you could almost excuse the poor color reproduction.

Lenovo's Active Pen was not included with this review unit, but the display is compatible with Wacom AES inking accessories.

Aimed at productivity

Lenovo Flex 5 15 keyboard and touchpad

Lenovo's "AccuType" keyboard doesn't quite match the quality and comfort of the fabled ThinkPad keyboard, but it's still one of the better keyboards I've used. The chiclet keys have the slightest curve to them, and three levels of backlight allow easy work in the dark. Everything is spaced as it should be, and a full line of F keys at the top have shortcuts for volume, screen brightness, touchpad toggle, airplane mode, and more.

Using the laptop as a daily driver for about a week, I had no trouble with the keyboard. If you're like me and type for hours at a time, day in and day out, this keyboard will serve you well. Keys have ample amount of travel, and bottoming out on the deck is soft.

The touchpad here uses Precision drivers for full Windows 10 gesture support, and the mylar finish is smooth and tracks well. Right out of the box, sensitivity is right where it should be, and there were no standout issues to report. It's sized appropriately for a 15-inch device, and there was no rattling when clicking.

A bit of fun

Lenovo Flex 5 15 gaming

Thanks to the dedicated GeForce 940MX GPU with 2GB of GDDR5 VRAM, the Flex 5 15 can be used for some light or medium gaming and a bit of multimedia editing.

Benchmarking with the 3DMark Sky Diver test ran up a score of 6,704. To put that into perspective, an average score from a 2013 gaming laptop is 9,595. It's clear the 940MX isn't a powerhouse, but it's an excellent boost for the integrated Intel HD Graphics 620.

If you need a PC with plenty of graphics power for specialized tasks, you'll want to look elsewhere. Just want to enjoy some lighter games in the evening? The Flex 5 should be up to the task, as long as you keep it light.


Lenovo Flex 5 15 performance

I used the Flex 5 15 as my primary device for about a week, and while using it, I found no standout issues. The Samsung SSD is fast, the DDR4-2133MHz RAM gets the job done, and the Core i7 CPU keeps everything running smoothly. I was even able to get in some light gaming thanks to the dedicated GeForce 940MX GPU.

The 52.5WHr battery clocks in between six and seven hours of standard use on a single charge. Under heavy load, expect that to drop down to about four or five hours of use. If you really stretch it, this laptop can no doubt last an eight-hour workday, but, in most cases, expect to bring a charger with you to the office.


Geekbench 4.0 Benchmarks (Higher is better)

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DeviceCPUSingle coreMulti core
Lenovo Flex 5 15i7-7500U3,9767,730
Lenovo Yoga 720 15i7-7700HQ3,78410,255
Lenovo ThinkPad X1 Yoga (2nd Gen)i5-7200U3,9117,549
Surface Laptopi5-7200U3,7257,523
Lenovo ThinkPad T470i5-7300U vPro4,3948,580
Dell Latitude 5285i7-7600U4,6359,289
Lenovo ThinkPad X270i7-7600U4,5128,566
Lenovo ThinkPad T470si5-7300U vPro3,9196,077
Lenovo Yoga 720 13i5-7200U3,8817,509
Lenovo X1 Carboni5-7300U4,1398,311
HP EliteBook x360 G2i7-7600U4,4968,435
Samsung Notebook 9 15 Exti7-7500U4,3168,320
Dell Latitude 7280i7-7600U4,3817,935
Dell XPS 13 (9360)i7-6560U4,1207,829
HP Spectre 13i7-7500U4,1007,469
Surface Booki7-6600U3,9487,415

The Intel Core i7-7500U CPU is a laptop-class piece of hardware and thus doesn't perform to the same level as other CPUs (like the i7-7700HQ in the Yoga 720). It tested well in Geekbench 4, but if you're looking for a machine that can handle heavy tasks, you'll probably want to look elsewhere. Still, it performs exactly as it should, and will chew through everyday work with ease.


Geekbench 4.0 Graphics OpenCL (Higher is better)

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Lenovo Flex 5 1516,912
Lenovo Yoga 720 1513,727
Lenovo ThinkPad X1 Yoga (2nd Gen)19,738
Surface Pro 201730,678
Surface Laptop19,256
Lenovo ThinkPad T47021,276
Dell Latitude 528521,921
Lenovo ThinkPad X27017,376
Lenovo ThinkPad T470s16,635
Lenovo Yoga 720 1318,185
Lenovo X1 Carbon20,932
Dell Latitude 548021,616
Dell XPS 13 (9360)19,410
Surface Book18,197
Dell Latitude 728017,827

The integrated Intel HD Graphics 620 scored well in the OpenCL test, and will be able to handle most everyday tasks you throw at it. The dedicated GeForce 940MX, which will take over for more intensive tasks, scored a 31,064 on the same test. This is enough graphics power for some medium-duty multimedia editing.


PCMark Home Conventional 3.0

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Lenovo Flex 5 152,634Better than 46 percent of all results
Lenovo Yoga 720 152,993Better than 57 percent of all results
Lenovo ThinkPad X1 Yoga (2nd Gen)2,773Better than 46 percent of all results
Surface Pro 20173,055Better than 57 percent of all results
Surface Laptop2,494Better than 40 percent of all results
Lenovo ThinkPad T4703,103Better than 62 percent of all results
Dell Latitude 52853,079Better than 57 percent of all results
Lenovo ThinkPad X2703,009Better than 57 percent of all results
Lenovo ThinkPad T470s2,576Better than 40 percent of all results
Lenovo Yoga 720 132,717Better than 46 percent of all results
Lenovo X1 Carbon Core i52,965Better than 57 percent of all results
Samsung Notebook 9 15 Ext2,998Better than 57 percent of all results
Dell XPS 15 (9560)3,534Better than 71 percent of all results
Dell Latitude 72802,829Better than 52 percent of all results
HP Spectre x360 152,472Better than 41 percent of all results

The PCMark Home Conventional test takes a bunch of your hardware and determines how well it works together while performing a number of everyday tasks. Overall, it performed exactly as it should, even beating out many other laptops with a significantly higher price tag.


CrystalDiskMark (Higher is better)

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Lenovo Flex 5 152,146 MB/s1,186 MB/s
Lenovo Yoga 720 151,839 MB/s1,238 MB/s
Lenovo ThinkPad X1 Yoga (2nd Gen)1,253 MB/s763.6 MB/s
Surface Laptop423 MB/s237 MB/s
Lenovo ThinkPad T4701,079 MB/s716.1 MB/s
Dell Latitude 52851,300 MB/s1,113 MB/s
Lenovo ThinkPad X270 PCIe1,049 MB/s636.9 MB/s
Lenovo ThinkPad T470s1,557 MB/s1,333 MB/s
Lenovo Yoga 7201,904 MB/s1,169 MB/s
Lenovo X1 Carbon1,518 MB/s1,188 MB/s
Samsung Notebook 9 15 Ext1,365 MB/s1,213 MB/s
Razer Blade Pro2,571 MB/s2,467 MB/s
Dell XPS 15 (9560)2,207 MB/s1,628 MB/s
Dell XPS 13 (9360)1,287 MB/s794 MB/s
HP Spectre x360 151,128 MB/s862 MB/s

The Samsung PCIe SSD gets the job done quickly, and there were no issues with its performance. The problem, however, is that Lenovo has partitioned about 30GB (using only about 1GB of that partition) for their own drivers and proprietary software. That's a huge chunk of real estate in an SSD that's only 256GB. When buying a new laptop, you shouldn't have to worry about getting rid of a mostly-unused partition.


Lenovo Flex 5 15 review: Conclusion

With a dedicated GeForce 940MX GPU, a Core i7 CPU, a Samsung PCIe SSD, and DDR4 RAM, the Flex 5 15 is a bit of a sleeper, especially at this price. The build quality is about the same as the pricier Yoga 720, and you could mistake them from a distance. However, we see the price difference in the display and the notebook-class CPU, as well as the fan that can get loud at times. Likewise, the battery here doesn't last quite as long.

If your budget requires you to stay below $900, the Flex 5 15 is no doubt quite attractive. A Dell XPS 15 with a Core i3 CPU, a hard-disk drive, and no dedicated GPU only starts at $1,000. If you like the look of this laptop, but require a device that can handle more intensive tasks as well as some heavier gaming, have a look at the Yoga 720. If on the other hand, you like the look and don't need quite as much performance, the Flex 5 15 is a decent all-around convertible laptop that could potentially save you a few hundred dollars.

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  • Quality build.
  • Excellent performance.
  • Good selection of ports.
  • Dedicated GPU.
  • Legit keyboard.


  • SSD comes with a large partition.
  • Poor color accuracy and a dim display.
  • The fan can get loud when under load.
Cale Hunt

Cale Hunt brings to Windows Central more than eight years of experience writing about laptops, PCs, accessories, games, and beyond. If it runs Windows or in some way complements the hardware, there’s a good chance he knows about it, has written about it, or is already busy testing it.