Solved proverbial question of will a pcie 3.0 work with a pcie 1.0a

September 29, 2020 at 13:07:06
Specs: linux, intel core 2 duo/8gb
i'm looking up the same exact problem; i have a optiplex 745:
https://www.dell.com/downloads/glob...
with pcie 1.0a x16; it specifically states that the maximum energy is 75 watts
so a nvidia 750 ti that has a pci express 3.0 bus will work because it uses 60 watts

i had to abandoned that configuration though, because my motherboard memory caped at less than 4gb. that was the bottleneck

now i've come across another old desktop, but it has a max memory of 8gb. this is usable. this one also has a 75w cap, so i'm looking for something like a gtx 1650 with 4GB of GDDR5 memory running at up to 75W

i was also looking at the 1050 ti, but that model is somewhat dated and difficult to find


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#1
September 29, 2020 at 16:35:34
✔ Best Answer
All PCIE x16 graphic slots are "capped" at 75W. That's why cards that require more than 75W have a 6-pin connector or 8-pin connector to get additional power directly from the power supply. A 6-pin plug can supply up to 75 additional watts; 8-pin can supply up to 150. You'd obviously need a power supply that has the proper plugs & can handle the added load.

http://www.playtool.com/pages/psuco...

EDIT: There are also adapter plugs that can be used if necessary, as shown in the pic in the link above.

message edited by riider


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#2
September 29, 2020 at 19:23:19
i ended up purchasing a zotac gaming geforce gtx 1650 oc gddr6 to put in my asrock fata1ity m.b. / b450 chipset / ryzen 2600
i will take the evga 750 ti out of this desktop and put it in the optiplex 745

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