Why does my laptop's wireless card outperform my desktop's premium wireless card?

[OliT250]

My laptop is a Lenovo Flex 2-15 and it has an Intel(R) Dual Band Wireless-AC 3160 Card.
My desktop on the other hand has a D-Link DWA 582 Wireless AC1200 Dual-Band PCI Express Card.
However when I run tests on them both, my laptops can handle speeds of up to 45MB/S whereas my desktop can only handle speeds of up to 8MB/S. What's going on?

PC COMPONENTS BELOW:
PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-6500 3.2GHz Quad-Core Processor (Purchased For £0.00)
Motherboard: MSI - H170 Gaming M3 ATX LGA1151 Motherboard (Purchased For £0.00)
Memory: Kingston - HyperX Fury Black 8GB (2 x 4GB) DDR4-2133 Memory (Purchased For £0.00)
Storage: ADATA - Premier SP550 120GB 2.5" Solid State Drive (Purchased For £0.00)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For £0.00)
Video Card: MSI - GeForce GTX 1060 3GB 3GB GAMING X 3G Video Card (Purchased For £0.00)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case (Purchased For £0.00)
Power Supply: Corsair - CSM 650W 80+ Gold Certified Semi-Modular ATX Power Supply (Purchased For £0.00)
Operating System: Microsoft - Windows 10 Pro OEM 64-bit (Purchased For £0.00)
Wireless Network Adapter: D-Link - DWA-582 PCI-Express x1 802.11a/b/g/n/ac Wi-Fi Adapter (Purchased For £0.00)
Monitor: Acer - Z271 27.0" 1920x1080 144Hz Monitor (£399.98)
Keyboard: Corsair - STRAFE RGB Wired Gaming Keyboard (Purchased For £0.00)
Mouse: Corsair - Sabre RGB Wired Optical Mouse (Purchased For £0.00)
Headphones: Corsair - VOID 7.1 Channel Headset (Purchased For £0.00)
Generated by PCPartPicker 2017-09-05 22:47 BST+0100

 

[rontonomo]

maybe location of your pc vs where your laptop is?

 

[why_wolf]

First thing I would check would be to see if its even connecting over the AC standard over if its falling back to the b, g or n standard. With speeds that low I really wouldn't be surprised if its unable to make an AC connection and is falling back to an old standard to establish the wireless link.

If you just want to be sure the card works correctly at all with AC. I would move the desktop so it is in the same room and the antenna can has a clear line of sight with the router.

 

[OliT250]

First thing I would check would be to see if its even connecting over the AC standard over if its falling back to the b, g or n standard. With speeds that low I really wouldn't be surprised if its unable to make an AC connection and is falling back to an old standard to establish the wireless link.

If you just want to be sure the card works correctly at all with AC. I would move the desktop so it is in the same room and the antenna can has a clear line of sight with the router.

I did both tests in the exact same room so I'm not use what's going on. Is one card superior to the other?