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Is it possible to adapt PCIE 3 x4 to PCIE 2 x 8?

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Posted · Original PosterOP

Hi! I bought an NVMe SSD without looking up a whole lot about it for black friday. Turns out my motherboard has PCIE2 slots, not PCIE 3. I was looking up some data, and I found that PCIE2x8 has the same bandwidth as PCIE3x4. Is there a way to split PCIE3x4 to PCIE2x8 so that I can use an NVMe riser card without losing bandwidth? I tried looking on google, but it only sees "PCIE3 x8" and gives me many pcie threads for GPUs. Thanks!


EDIT: Changed title from 'split' to 'adapt' because 'split' implies a different thing than what I'm doing.

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@jstudrawa look. more pcie LOL 


but for @kirbykirby56i do NOT think this will work, but im not 100% certain. 

Rig 1: i7-9700k OC'd to 5.0ghz all core | EVGA XC RTX 2080Ti | ADATA DDR4 2400mhz 4x8gb | ASUS PRIME Z370-P | Asetek 550LC 120mm | ADATA 480GB SSD & Toshiba P300 3TB | Cooler Master Masterbox MB500 | Win 10 Home | Logitech G910 Orion Spectrum, G502 Proteus Spectrum, G933 Artemis Spectrum Snow Wireless Limited Edition, Corsair MM300 Mouse Pad | 2 MSI Optix Curved 27" FHD Monitors 


(before i sold the WD drive and MSI gpu - https://www.userbenchmark.com/UserRun/11946219 171 gaming. felt good.)


Rig 2: i7-7700k Stock clocks | MSI Armor GTX 1070 | ADATA DDR4 2400mhz 2x8GB | MSI Z270 A-Pro | WD Green 240GB SSD & 2TB Seagate HDD | Thermaltake Core G21 Tempered Glass Edition | Win 10 Home | 2 HP Omen FHD 144hz 24.5" Monitors 


Rig 3: i7-6700 | GT 730 & GT 645 OEM | Some random DDR4 2133mhz 2x8gb sticks | OEM Dell Mobo | WD Black 2TB HDD & Toshiba 1TB HDD | Win 10 Home | 3 27" Dell FHD Monitors 


Rig 4: i7-4770 | EVGA SSC 1050ti | Some random DDR3 ram 2x2gb and 2x4gb sticks | OEM Dell Mobo | Stock Cooler | 1TB WD Black HDD | Win 7 Home 




Rig 5 (dead and dismantled and sold) : i7-7820X OC'd to 4.8ghz all core | MSI DUKE 1080ti | ADATA DDR4 2400mhz 4x8gb | Gigabyte X299 UD4 PRO | Asetek 240mm AIO | WD Green 240gb SSD | Other various components that I can't remember


Rig 6 (same fate as rig 5) i7-8700k stock clocks | MSI DUKE 1080ti | ADATA DDR4 2400mhz 2x8gb | MSI Z370 A-Pro | Asetek 550LC 120mm | WD Green 240GB SSD & Toshiba 2TB HDD | Other various components that I can't Remember 

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No, bandwidth and lanes are different, the nvme drive uses 4 pcie lanes the bandwidth is the capability of data transfer through those lanes. You can’t split a lane.

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Posted · Original PosterOP

@Docretier I'm not looking for a simple cable- I understand there's probably gonna have to be a PCB involved. What I was wondering is if it's possible to have an intermediate board translate the PCIE2x8 to PCIE3x4, since the bandwidths match up. The board would connect to the computer motherboard on PCIE2x8, then to the PCIE3x4 to NVMe riser card. 

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