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04-04-2021

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P620 - Dual Quadro A6000 Cards

2021-04-04, 6:55 AM

I just received my new Thinkstation P620 with one Quadro A6000 card installed. I would like to add another A6000 card to my P620. Please see my questions below.

 

1) Can the P620 support two Quadro A6000 cards? There was no option to add more than one A6000 card at the time of purchase. The configurator did allow for two Quadro RTX 8000 cards - which suggests that two A6000 cards should be possible.

 

2) Can the long extender itself for the A6000 be purchased separately from Lenovo? That would allow me to adapt an A6000 from a third-party vendor to install perfectly in the P620. The only way to get an additional A6000 right now is from another vendor as Lenovo has not made any available for purchase as an accessory.

 

3) What are the steps to provide accessory power from the PSU to the A6000? Does it require special connectors that I would need to purchase? The power supply cabling for the P620 doesn't appear to be clearly documented in the manual.

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1097 Posts

01-14-2014

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Re:P620 - Dual Quadro A6000 Cards

2021-04-05, 19:30 PM

1) You mentioned needing a 6-pin to 8-pin adapter (FRU: 00XL159) to add a second A6000 card. It appears that I would also need to do some rewiring of the factory-installed A6000 which currently receives power from both GFX_PWR1 and GFX_PWR2 (described above). I would need to connect the second 8pin connector from the GPU's splitter cable to the 6pin drop cable from GFX_PWR1 using the 6pin to 8pin adapter you mentioned. As a result the factory-installed A6000 would receive all of its accessory power only from GFX_PWR1. This would free up both drop cables (a 6pin and an 8pin) from GFX_PWR2 to power the second A6000. Does this sound correct?

 

- GFX_PWR1 and GFX_PWR2 are two separate 12V rails leading back to the 1000W PSU in the P620.  In order to add a 2nd RTX A6000 card in your system, you'll need to connect each 12V rail to their own GPU (i.e., Connect GFX_PWR1 to the 1st RTX A6000 and Connect GFX_PWR2 to the 2nd RTX A6000). By doing this, you'll need 2x 6-pin to 8-pin splitter cables to convert the 6-pin from each of the 12V rails to an 8pin connector to power each of the GPU's. 

 

2) Would you know why the factory-installed A6000 is not wired to receive its power from solely one of the two onboard power connectors, either GFX_PWR1 or GFX_PWR2? Each of the power connectors is a dedicated 12V rail according to Lenovo's documentation, and each rail's dual drop cables (6pin and 8 pin together) provide 225 W of accessory power in total - in theory enough for the A6000 which also receives 75W from the PCIe slot on the motherboard itself. I'm wondering if the factory discovered an issue where the A6000 actually required power from both 12V rails to function properly.

 

- The reason why manufacturing likely connected it this way is to balance the power from the card across both 12V rails.  

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1097 Posts

01-14-2014

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  • Message 2 of 4

Re:P620 - Dual Quadro A6000 Cards

2021-04-05, 14:26 PM

This is sort of a tricky question, but see my answers to your question(s) below:

 

1) Can the P620 support two Quadro A6000 cards? There was no option to add more than one A6000 card at the time of purchase. The configurator did allow for two Quadro RTX 8000 cards - which suggests that two A6000 cards should be possible.

 

- Eventually, we will be able to support dual A6000 cards from the factory.  But, due to some internal stuff, we can't ship dual A6000 cards from the factory at this time.  But, there's likely nothing stopping customers from adding in a 2nd A6000 card on their own. 

 

2) Can the long extender itself for the A6000 be purchased separately from Lenovo? That would allow me to adapt an A6000 from a third-party vendor to install perfectly in the P620. The only way to get an additional A6000 right now is from another vendor as Lenovo has not made any available for purchase as an accessory.

 

- It looks like we don't have a way to offer the A6000 brackets separately from the card.  But, we're working on adding the A6000 GPU as an option part. 

 

3) What are the steps to provide accessory power from the PSU to the A6000? Does it require special connectors that I would need to purchase? The power supply cabling for the P620 doesn't appear to be clearly documented in the manual.

 

- The A6000 card should be bundled with an 8pin EPS-> dual 8pin PCIe splitter cable.  This is needed to be able to connect the PCIe aux power drops inside the P620 chassis.  The only other dongles I can think that you'll need to power dual A6000 cards in a P620 system would be a 6-pin to 8-pin splitter (FRU: 00XL159).  

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8 Posts

04-04-2021

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Re:P620 - Dual Quadro A6000 Cards

2021-04-05, 17:56 PM

Thanks for answering my questions on adding a second A6000 card to the P620 workstation. I do have additional questions about providing accessory power to the A6000 card from the onboard power connections in the P620.

 

I did find a Lenovo document for the P620 titled "Power Configurator." The document says there are two onboard power connectors, GFX_PWR_1 and GFX_PWR_2. Each of these power connectors has a dual drop cable with an 8pin connector and a 6pin connector.

 

I took a look inside my P620 case. The factory-installed A6000 receives power from both of the onboard power connectors, GFX_PWR_1 and GFX_PWR_2.  As you mentioned in your reply the A6000 uses an 8pin EPS-> dual 8pin PCIe splitter cable. In the P620 the first 8pin connector from the GPU's splitter cable is connected to the 8pin connector from GFX_PWR_1, and the second to GFX_PWR2. That leaves two available power connectors remaining, one 6pin from GFX_PWR_1 and another 6pin from GFX_PWR2.

 

Based on this information I have two questions:

 

1) You mentioned needing a 6-pin to 8-pin adapter (FRU: 00XL159) to add a second A6000 card. It appears that I would also need to do some rewiring of the factory-installed A6000 which currently receives power from both GFX_PWR1 and GFX_PWR2 (described above). I would need to connect the second 8pin connector from the GPU's splitter cable to the 6pin drop cable from GFX_PWR1 using the 6pin to 8pin adapter you mentioned. As a result the factory-installed A6000 would receive all of its accessory power only from GFX_PWR1. This would free up both drop cables (a 6pin and an 8pin) from GFX_PWR2 to power the second A6000. Does this sound correct?

 

2) Would you know why the factory-installed A6000 is not wired to receive its power from solely one of the two onboard power connectors, either GFX_PWR1 or GFX_PWR2? Each of the power connectors is a dedicated 12V rail according to Lenovo's documentation, and each rail's dual drop cables (6pin and 8 pin together) provide 225 W of accessory power in total - in theory enough for the A6000 which also receives 75W from the PCIe slot on the motherboard itself. I'm wondering if the factory discovered an issue where the A6000 actually required power from both 12V rails to function properly.

 

 

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1097 Posts

01-14-2014

United States of America

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  • Posts: 1097
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  • Message 4 of 4

Re:P620 - Dual Quadro A6000 Cards

2021-04-05, 19:30 PM

1) You mentioned needing a 6-pin to 8-pin adapter (FRU: 00XL159) to add a second A6000 card. It appears that I would also need to do some rewiring of the factory-installed A6000 which currently receives power from both GFX_PWR1 and GFX_PWR2 (described above). I would need to connect the second 8pin connector from the GPU's splitter cable to the 6pin drop cable from GFX_PWR1 using the 6pin to 8pin adapter you mentioned. As a result the factory-installed A6000 would receive all of its accessory power only from GFX_PWR1. This would free up both drop cables (a 6pin and an 8pin) from GFX_PWR2 to power the second A6000. Does this sound correct?

 

- GFX_PWR1 and GFX_PWR2 are two separate 12V rails leading back to the 1000W PSU in the P620.  In order to add a 2nd RTX A6000 card in your system, you'll need to connect each 12V rail to their own GPU (i.e., Connect GFX_PWR1 to the 1st RTX A6000 and Connect GFX_PWR2 to the 2nd RTX A6000). By doing this, you'll need 2x 6-pin to 8-pin splitter cables to convert the 6-pin from each of the 12V rails to an 8pin connector to power each of the GPU's. 

 

2) Would you know why the factory-installed A6000 is not wired to receive its power from solely one of the two onboard power connectors, either GFX_PWR1 or GFX_PWR2? Each of the power connectors is a dedicated 12V rail according to Lenovo's documentation, and each rail's dual drop cables (6pin and 8 pin together) provide 225 W of accessory power in total - in theory enough for the A6000 which also receives 75W from the PCIe slot on the motherboard itself. I'm wondering if the factory discovered an issue where the A6000 actually required power from both 12V rails to function properly.

 

- The reason why manufacturing likely connected it this way is to balance the power from the card across both 12V rails.  

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