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You need to update your BIOS. You can generally buy either one but you will only go as fast as your motherboard will support.<br />
<br />
But my suggestion is keep similar type as recommended by Crucial site and DELL<br />
<br />
<a href="https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-7040-sff" rel="ugc">https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-7040-sff</a>
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You need to update your BIOS. You can generally buy either one but you will only go as fast as your motherboard will support.

But my suggestion is keep similar type as recommended by Crucial site and DELL

https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-7040-sff [https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-7040-sff]

Owner

Alan Silverman

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Thanks for your help,<br />
Al
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Here is memory on sale at Newegg for $85.<br />
<br />
G.SKILL Aegis 32GB (2 x 16GB) 288-Pin DDR4 SDRAM DDR4 2666 (PC4 21300) Desktop Memory Model F4-2666C19D-32GIS <br />
DDR4 2666 (PC4 21300)<br />
Timing 19-19-19-43<br />
CAS Latency 19<br />
Voltage 1.2V<br />
<br />
Here is compatible memory according to Crucial memory scanner:<br />
DDR4 PC4-19200 • CL=17 • SINGLE RANKED • X8 BASED • UNBUFFERED • NON-ECC • DDR4-2400 • 1.2V •<br />
<br />
I currently have 4 sticks of 4GB memory. I'd take out two and substitute the 16GB sticks. Will this work?<br />
Thanks,<br />
Al
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Here is memory on sale at Newegg for $85.

G.SKILL Aegis 32GB (2 x 16GB) 288-Pin DDR4 SDRAM DDR4 2666 (PC4 21300) Desktop Memory Model F4-2666C19D-32GIS 
DDR4 2666 (PC4 21300)
Timing 19-19-19-43
CAS Latency 19
Voltage 1.2V

Here is compatible memory according to Crucial memory scanner:
DDR4 PC4-19200 • CL=17 • SINGLE RANKED • X8 BASED • UNBUFFERED • NON-ECC • DDR4-2400 • 1.2V •

I currently have 4 sticks of 4GB memory. I'd take out two and substitute the 16GB sticks. Will this work?
Thanks,
Al

Will this memory work with my Dell Optiplex 7040

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A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.