Dell Precision 7540 and 7740 Owner's Thread

@skakckc I noticed you listed 128GB ECC RAM in your post spec footer. Could you provide RAM module manufacturer and serial or better yet, send a pic? I've been trying to find standalone 32GB SODIMM 260-pin ECC modules but to no avail. Highly curious to know where dell gets them from. I suspect it's samsung but not sure. Thanks!

 

Currently, can't take a picture due project deadlines.

Here some infos from HWInfo64

General information
Total Memory Size: 128 GBytes

Current Performance Settings
Maximum Supported Memory Clock: 1333.3 MHz
Current Memory Clock: 1330.1 MHz
Current Timing (tCAS-tRCD-tRP-tRAS): 19-19-19-43
Memory Channels Supported: 2
Memory Channels Active: 2

Command Rate: 2T
Read to Read Delay (tRD_RD) Same Rank: 7T
Read to Read Delay (tRD_RD) Different Rank: 4T
Read to Read Delay (tRD_RD) Different DIMM: 7T
Write to Write Delay (tWR_WR) Same Rank: 7T
Write to Write Delay (tWR_WR) Different Rank: 4T
Write to Write Delay (tWR_WR) Different DIMM: 8T
Read to Write Delay (tRD_WR) Same Rank: 9T
Read to Write Delay (tRD_WR) Different Rank: 10T
Read to Write Delay (tRD_WR) Different DIMM: 12T
Write to Read Delay (tWR_RD) Same Rank (tWTR): 33T
Write to Read Delay (tWR_RD) Different Rank: 27T
Write to Read Delay (tWR_RD) Different DIMM: 7T
RAS# to RAS# Delay (tRRD): 7T
Refresh Cycle Time (tRFC): 734T
Four Activate Window (tFAW): 28T

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General Module Information
Module Number: 0
Module Size: 32 GBytes
Memory Type: DDR4 SDRAM
Module Type: 72b-SO-UDIMM
Memory Speed: 1333.3 MHz (DDR4-2666 / PC4-21300)
Module Manufacturer: Samsung
Module Part Number: M474A4G43MB1-CTD
Module Revision: 0.0
Module Serial Number: 2069859843
Module Manufacturing Date: Year: 2019, Week: 30
Module Manufacturing Location: 1
SDRAM Manufacturer: Samsung
DRAM Steppping: 0.0
Error Check/Correction: ECC

Module Characteristics
Row Address Bits: 17
Column Address Bits: 10
Module Density: 16384 Mb
Number Of Ranks: 2
Device Width: 8 bits
Bus Width: 72 bits
Die Count: 1
Module Nominal Voltage (VDD): 1.2 V
Minimum SDRAM Cycle Time (tCKAVGmin): 0.75000 ns
Maximum SDRAM Cycle Time (tCKAVGmax): 1.60000 ns
CAS# Latencies Supported: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
Minimum CAS# Latency Time (tAAmin): 13.750 ns
Minimum RAS# to CAS# Delay (tRCDmin): 13.750 ns
Minimum Row Precharge Time (tRPmin): 13.750 ns
Minimum Active to Precharge Time (tRASmin): 32.000 ns

Supported Module Timing at 1333.3 MHz: 19-19-19-43
Supported Module Timing at 1200.0 MHz: 17-17-17-39
Supported Module Timing at 1066.7 MHz: 15-15-15-35
Supported Module Timing at 933.3 MHz: 13-13-13-30
Supported Module Timing at 800.0 MHz: 11-11-11-26
Supported Module Timing at 666.7 MHz: 10-10-10-22

Minimum Active to Active/Refresh Time (tRCmin): 45.750 ns
Minimum Refresh Recovery Time Delay (tRFC1min): 550.000 ns
Minimum Refresh Recovery Time Delay (tRFC2min): 350.000 ns
Minimum Refresh Recovery Time Delay (tRFC4min): 260.000 ns
Minimum Four Activate Window Delay Time (tFAWmin): 21.000 ns
Minimum Active to Active Delay Time - Different Bank Group (tRRD_Smin): 3.000 ns
Minimum Active to Active Delay Time - Same Bank Group (tRRD_Lmin): 4.900 ns
Minimum CAS to CAS Delay Time - Same Bank Group (tCCD_Lmin): 5.000 ns

Features
Module Temperature Sensor (TSOD): Supported
Temperature Sensor Location: Front Side
Module Nominal Height: 29 - 30 mm
Module Maximum Thickness (Front): 1 - 2 mm
Module Maximum Thickness (Back): 1 - 2 mm



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Does anybody know if the LTE card DW8511e will work in the 7740 which officially comes with DW8521e?

 

Anyone know if its possible to convert a 7740 with an FHD screen to 4k one? I know the FHD uses a 30 pin and the 4k uses a 40 pin connector, was wondering if anyone knew if this connector was soldered down or removable...?

 

The cable is removable on both ends, so it should be possible if you can locate the appropriate replacement cable.

 

I wonder if the 4k panel can be mounted in the Carbon Fiber lid? I also wonder if the cable for eDP and camera module is combined, so you would also have to have the IR Camera module and bezel for it to function. In any case, these parts may have not changed since the 7720, so if you could find a complete 7730 lid assembly it may work fine with the 7740.

I also wonder if a 144hz FHD panel could be used in place of the 4k panel...

 

The display and camera cables are combined on the motherboard side, I believe. Without the IR camera, it should be possible to use the 4K+camera display cable from the 7730 (if the IR camera cable is not the same... it's just a USB connection on the camera side so it might be the same). I don't expect that there would be trouble mounting the 4K panel in the carbon fiber lid but I don't know if anyone has tried it (obviously this was not a problem with the 7730, and no one has identified any differences in the chassis). Regarding a 144 Hz panel, these systems seem happy to take any eDP panel so as long as the cable connects then and it can be mounted then it should be fine. It might require graphics switching disabled, I'm not sure if the Intel GPU can drive the refresh rate up that high?

 

I think 144Hz would not be an issue with the Intel GPU. It is still less bandwidth than 4k at 60Hz. I currently have a 120Hz 94% NTSC TN (Chimei N173HHE-G32 Rev C2) panel that I installed in an Alienware 17R4 that I am thinking about switching back to its stock 60Hz panel so I can sell the laptop without any warranty issues. If I ordered the UHD cable for the 7740 I could test the 120Hz panel to see if it is compatible.

Edit: After chatting with Dell Spare Parts, they told me the UHD assembly is spared as a complete unit and the cable is not sold separately like it is for the FHD display. The price for the whole assembly is $675. They also told me that the UHD cable for the 7730 is a different part than the 7740, which does not surprise me as the IR camera module is different as well.

 

But the connector on the motherboard/video card side is 40 pin for 4k and 30 pin for FHD, right?

 

Nope—40 pin, universally. Dell already has 7+ motherboard combinations for each CPU; adding one extra for each display type would be pointlessly expensive.