Precision 7750 ram upgrade

Question

I would like to confirm that a 2 x 32Gb SODIMM configuration is supported on the Precision 7750. This configuration is shown as an optional configuration during purchase, but it is not shown as a supported configuration in the Precision 7750 Setup and Specifications Guide. I assume the guide is incomplete, but I wanted to confirm that before ordering memory.

Assuming the guide in incomplete, it would be helpful if Dell could provide a more complete description of the supported memory configurations. Also shown as an option during purchase is a 96Gb (2 x 16Gb/2 x 32Gb) configuration, but that is not covered by the Setup and Specification Guide either.

JamesJAB1 · Answer

Here are the highest RAM configurations for this machine:

128 GB, 4 x 32 GB, DDR4, 2933 MHz, ECC, SODIMM

128 GB, 4 x 32 GB, DDR4, 2933 MHz, Non-ECC, SODIMM

32 GB, 4 x 8 GB, DDR4, 3200 MHz SuperSpeed, Non-ECC, SODIMM

If you want the absolute fastest RAM speed (3200MHz) you can only use 8GB sticks. If you don't mind running the slightly slower 2933MHz speed you can populate it with 32GB sticks. (Do not mix ECC and Non-ECC RAM)

Powderboy · Answer

Thanks for the response, but it really doesn't answer my question.

JamesJAB1 · Answer

Oh, I see what you are talking about. Here is the simplest way to look at it.

For RAM speeds 2666MHz and 2933MHz you can use any combination of RAM sticks up to 32GB each.
2x32GB and 2x16GB will work just fine

For the super speed option 3200MHz you can use any combination of RAM sticks up to 8GB each (Though they do list a single 16GB stick, so 2x16GB sticks should work)

Myki1 · Answer

Hi! I've upgraded RAM from 2x8GB to 4x8GB but it runs at 2128MHz (2x1064MHz). Is it expected behavior for that RAM configuration to not run at 3200MHz? CPU-Z   Northbridge Intel Comet Lake rev. 02 Southbridge Intel WM490 rev. 00 Bus Specification PCI-Express 3.0 (8.0 GT/s) Graphic Interface PCI-Express Memory Type DDR4 Memory Size 32 GBytes Channels Dual Memory Frequency 1064.1 MHz (1:16) CAS# latency (CL) 15.0 RAS# to CAS# delay (tRCD) 15 RAS# Precharge (tRP) 15 Cycle Time (tRAS) 35 Row Refresh Cycle Time (tRFC) 374 Command Rate (CR) 2T Uncore Frequency 4289.5 MHz Host Bridge 0x9B54     Memory SPD   DIMM # 1      SMBus address 0x50      Memory type DDR4      Module format SO-DIMM      Module Manufacturer(ID) Crucial Technology (7F7F7F7F7F9B0000000000000000)      SDRAM Manufacturer (ID) Micron Technology (2C00000000000000000000000000)      Size 8192 MBytes      Max bandwidth DDR4-3200 (1600 MHz)      Part number CT8G4SFRA32A.C8FE      Serial number E51E37BA      Manufacturing date Week 04/Year 21      Nominal Voltage 1.20 Volts      EPP no      XMP no      AMP no JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency      JEDEC #1 10.0-10-10-24-34 @ 727 MHz      JEDEC #2 11.0-11-11-26-37 @ 800 MHz      JEDEC #3 12.0-12-12-28-40 @ 872 MHz      JEDEC #4 13.0-14-14-31-44 @ 945 MHz      JEDEC #5 14.0-14-14-33-47 @ 1018 MHz      JEDEC #6 15.0-15-15-35-50 @ 1090 MHz      JEDEC #7 16.0-16-16-38-54 @ 1163 MHz      JEDEC #8 17.0-17-17-40-57 @ 1236 MHz      JEDEC #9 18.0-18-18-42-60 @ 1309 MHz      JEDEC #10 19.0-19-19-45-64 @ 1381 MHz      JEDEC #11 20.0-20-20-47-67 @ 1454 MHz      JEDEC #12 21.0-21-21-49-70 @ 1527 MHz      JEDEC #13 22.0-22-22-52-74 @ 1600 MHz      JEDEC #14 23.0-22-22-52-74 @ 1600 MHz      JEDEC #15 24.0-22-22-52-74 @ 1600 MHz     DIMM # 2      SMBus address 0x51      Memory type DDR4      Module format SO-DIMM      Module Manufacturer(ID) Micron Technology (2C00000000000000000000000000)      SDRAM Manufacturer (ID) Micron Technology (2C00000000000000000000000000)      Size 8192 MBytes      Max bandwidth DDR4-3200 (1600 MHz)      Part number 8ATF1G64HZ-3G2J1      Serial number 2A57CB33      Manufacturing date Week 36/Year 20      Nominal Voltage 1.20 Volts      EPP no      XMP no      AMP no JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency      JEDEC #1 10.0-10-10-24-34 @ 727 MHz      JEDEC #2 11.0-11-11-26-37 @ 800 MHz      JEDEC #3 12.0-12-12-28-40 @ 872 MHz      JEDEC #4 13.0-14-14-31-44 @ 945 MHz      JEDEC #5 14.0-14-14-33-47 @ 1018 MHz      JEDEC #6 15.0-15-15-35-50 @ 1090 MHz      JEDEC #7 16.0-16-16-38-54 @ 1163 MHz      JEDEC #8 17.0-17-17-40-57 @ 1236 MHz      JEDEC #9 18.0-18-18-42-60 @ 1309 MHz      JEDEC #10 19.0-19-19-45-64 @ 1381 MHz      JEDEC #11 20.0-20-20-47-67 @ 1454 MHz      JEDEC #12 21.0-21-21-49-70 @ 1527 MHz      JEDEC #13 22.0-22-22-52-74 @ 1600 MHz      JEDEC #14 23.0-22-22-52-74 @ 1600 MHz      JEDEC #15 24.0-22-22-52-74 @ 1600 MHz     DIMM # 3      SMBus address 0x52      Memory type DDR4      Module format SO-DIMM      Module Manufacturer(ID) Crucial Technology (7F7F7F7F7F9B0000000000000000)      SDRAM Manufacturer (ID) Micron Technology (2C00000000000000000000000000)      Size 8192 MBytes      Max bandwidth DDR4-3200 (1600 MHz)      Part number CT8G4SFRA32A.C8FE      Serial number E51E3D45      Manufacturing date Week 04/Year 21      Nominal Voltage 1.20 Volts      EPP no      XMP no      AMP no JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency      JEDEC #1 10.0-10-10-24-34 @ 727 MHz      JEDEC #2 11.0-11-11-26-37 @ 800 MHz      JEDEC #3 12.0-12-12-28-40 @ 872 MHz      JEDEC #4 13.0-14-14-31-44 @ 945 MHz      JEDEC #5 14.0-14-14-33-47 @ 1018 MHz      JEDEC #6 15.0-15-15-35-50 @ 1090 MHz      JEDEC #7 16.0-16-16-38-54 @ 1163 MHz      JEDEC #8 17.0-17-17-40-57 @ 1236 MHz      JEDEC #9 18.0-18-18-42-60 @ 1309 MHz      JEDEC #10 19.0-19-19-45-64 @ 1381 MHz      JEDEC #11 20.0-20-20-47-67 @ 1454 MHz      JEDEC #12 21.0-21-21-49-70 @ 1527 MHz      JEDEC #13 22.0-22-22-52-74 @ 1600 MHz      JEDEC #14 23.0-22-22-52-74 @ 1600 MHz      JEDEC #15 24.0-22-22-52-74 @ 1600 MHz     DIMM # 4      SMBus address 0x53      Memory type DDR4      Module format SO-DIMM      Module Manufacturer(ID) Micron Technology (2C00000000000000000000000000)      SDRAM Manufacturer (ID) Micron Technology (2C00000000000000000000000000)      Size 8192 MBytes      Max bandwidth DDR4-3200 (1600 MHz)      Part number 8ATF1G64HZ-3G2J1      Serial number 2A57CAE8      Manufacturing date Week 36/Year 20      Nominal Voltage 1.20 Volts      EPP no      XMP no      AMP no JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency      JEDEC #1 10.0-10-10-24-34 @ 727 MHz      JEDEC #2 11.0-11-11-26-37 @ 800 MHz      JEDEC #3 12.0-12-12-28-40 @ 872 MHz      JEDEC #4 13.0-14-14-31-44 @ 945 MHz      JEDEC #5 14.0-14-14-33-47 @ 1018 MHz      JEDEC #6 15.0-15-15-35-50 @ 1090 MHz      JEDEC #7 16.0-16-16-38-54 @ 1163 MHz      JEDEC #8 17.0-17-17-40-57 @ 1236 MHz      JEDEC #9 18.0-18-18-42-60 @ 1309 MHz      JEDEC #10 19.0-19-19-45-64 @ 1381 MHz      JEDEC #11 20.0-20-20-47-67 @ 1454 MHz      JEDEC #12 21.0-21-21-49-70 @ 1527 MHz      JEDEC #13 22.0-22-22-52-74 @ 1600 MHz      JEDEC #14 23.0-22-22-52-74 @ 1600 MHz      JEDEC #15 24.0-22-22-52-74 @ 1600 MHz

Lucifer archangel of knowledge · Answer

Hello,

You can't use the Ram you want, it is according to the frequency (MHz).

Here is the official sheet, it's easier.
https://www.dell.com/support/manuals/en-us/precision-17-7750-laptop/precision_7750_specs/memory?guid=guid-f07064b8-2eb4-49ec-88a8-43b102e42417&lang=en-us

Attention, your model may have 4 memory slots and not two. If it has 4, usually two are under the computer, and the last two under the keyboard.

https://www.dell.com/support/home/en-us?app=drivers

This is according to the product ID, not the Precision 7750 part number, but the ID, because a part number can have several IDs; your ID is indicated on a label stuck on the computer.

By entering your ID, you'll have access to all your drivers and component manuals in PDF format.

Be well.

babenson · Answer

For what it is worth my 7750 came with the 128G (4 x 32G 2933Mhz) non ecc config and when you check the modules supplied they are actually 3200Mhz ones

Hynix HMAA4GS6AJR8N-XN parts which are DDR4-3200 / PC4-25600 ones. The laptop just runs them at 2933Mhz

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