2015 HP ProDesk Mini 600 G2 [6th,2C,T] + GTX 1060 @ 8Gbps-M2 (ADT-Link R53SF ) ...
 
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2015 HP ProDesk Mini 600 G2 [6th,2C,T] + GTX 1060 @ 8Gbps-M2 (ADT-Link R53SF ) + Win10 [ciforia]  

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Jezzaw007
(@jezzaw007)
New Member
Joined: 1 year ago
 

@ciforia

Hi, really interesting read, im looking to do similar.
I'm not sure I understand how or where your screenshots demonstrate that your getting 8gb throughput on PCIe 3.0 x1 ?
Given that the specifications on PCIe 3.0 are [email protected] and then halved, [email protected], [email protected], and only [email protected]
The GFX card your using has a max 8Gbps throughput, so your only ever going to achieve a maximum of 4gb on 1x slot?

Any help appreciated, thanks.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@jezzaw007

He's using the R53SF adapter. The "3" means "PCIe x16". The "5" means "M.2 key A/E" which is PCIe x1. PCIe 3.0 x1 is 8 Gb/s.

You made a couple mistakes in your math. From [email protected], you halved the bandwidth but the link width is quartered. They should both be quartered to get [email protected] I think you mean gigabytes instead of gigabits, so they should be:
32GB/[email protected], 16GB/[email protected], 8GB/[email protected], 2GB/[email protected]
But those bandwidth speeds are for both directions. You need to half them to get single direction bandwidth (for read/write, or Device to Host and Host to Device speeds) like this:
16GB/[email protected], 8GB/[email protected], 4GB/[email protected], 1GB/[email protected]
Multiply them by 128 and divide by 130 to get the actual data rate. 8 Gb/s is  7.876923076923077 Gb/s because encoding on the wire is 128b/130b for PCIe 3.0.
For more info, see https://en.wikipedia.org/wiki/PCI_Express

So the maximum speed in either direction for PCIe 3.0 x1 is: 984.6 MB/s

The number shown by the benchmark is 784.073 MiB/s which is 822.16 MB/s. That is lower than 984.6 MB/s because of PCIe overhead. It's actually a really good portion of the max and you can't expect more than that from any similarly connected PCIe device.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Jezzaw007
(@jezzaw007)
New Member
Joined: 1 year ago
 

@joevt

Many thanks for the quick response and brilliant explanation, makes total sense now.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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frank089
(@frank089)
New Member
Joined: 1 year ago
 

@ciforia

Hello, this is sanjeev, new to egpu, i have hp prodesk 400, need to connect external gpu, please help me with what all i need to buy and where to buy and how to connect.. sorry for bad English

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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ciforia
(@ciforia)
Active Member
Joined: 3 years ago
 

@taika-kim, yeah I ended up cutting a small part of the chassis to make it work. 

 

2015 HP ProDesk Mini 600 G2 [6th,2C,T] + GTX 1060 @ 8Gbps-M2 (ADT-Link R53SF ) + Win10 [build link]  

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