Jun 02, 2015 It's pretty rare that I have the chance to open one of our ESXi hosts, but I need to know if all RAM banks are being used. If so, I'll need to order and install a second processor so I can add more RAM to the hosts (Dell Poweredge R410 & R610). When we had physical servers I would run the Crucial memory scanner. Good to figure out the number of slots. Boot to bios and check. (Careful not to mess with settings here if you are not sure of what you are doing.) 2. Good to figure out the number of slots. Programs made to scan hardware in windows.
Mac Pro (2019) has 12 DIMM (memory) slots that support up to 1.5TB of 2933MHz memory when all 12 slots are full using DDR4 ECC DIMMs.
8-core, 12-core, and 16-core Mac Pro models support up to 768GB of memory.
Before you begin
You can use either R-DIMMs or LR-DIMMs with your Mac Pro, but you can't mix these memory types. To check if you have R-DIMMs or LR-DIMMs installed and view your memory status, choose Apple menu > About This Mac, then select the Memory tab.
Make sure that you use the same type of memory when installing additional DIMMs or replacing DIMMs. Learn more about Mac Pro (2019) memory specifications.
Apple recommends that you use Apple-approved DIMMs. You can purchase memory upgrade kits by visiting an Apple Store or Apple Authorized Reseller. If you need to order replacement memory, contact Apple.
Check supported configurations
Mac Pro supports up to 12 DIMMs installed in configurations of 4, 6, 8, 10, or 12 DIMMs, as shown in the images below. These images can also be found on the inside of the DIMM covers. For maximum performance, install DIMMs in a 6 or 12 DIMM configuration. If you have R-DIMMs that aren't identical in capacity, learn how to install R-DIMMs of mixed capacities.
A 1 DIMM configuration is for diagnostic use only.
4 DIMMs
6 DIMMs
8 DIMMs
10 DIMMs
12 DIMMs
Each number represents a DIMM slot. For each DIMM configuration, insert DIMMs only into the dark grey slots and leave the light gray slots empty.
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Installing R-DIMMs of mixed capacities
If you use 32GB DIMMs with other capacities, such as 8GB or 16GB, they must be installed according to these requirements:
- Use only R-DIMMs.
- Use a supported configuration.
- Install the 32GB DIMMs in the first slot of each channel pair.
Not all memory channels are used for every DIMM configuration. For example, an 8 DIMM configuration uses channels A, B, D, and E.
DIMM Channels
In the image above, the 12 slots on the left form 6 channel pairs as shown on the right. Each channel pair has slots designated DIMM 1 and DIMM 2.
Installing LR-DIMMs of mixed capacities
To install LR-DIMMs of mixed capacities, install your DIMMs in the slots determined by your configuration.
Remove or install memory
Learn how to remove the housing of your Mac Pro, remove DIMMs, and install DIMMs.
Remove the housing or memory access door
Follow the steps to remove the housing on Mac Pro (2019) or the access door on Mac Pro (Rack, 2019).
Mac Pro (2019)
- Shut down your Mac Pro.
- Wait approximately 5-10 minutes for the computer to cool down.
- Unplug all cables except the power cord from your computer.
- Touch the metal housing on the outside of the Mac Pro to discharge any static electricity, then unplug the power cord.
Always discharge static before you touch parts or install components inside your Mac Pro. To avoid generating static, don’t move around the room until you finish installing the memory and slide the enclosure back onto the computer. - Flip the top latch up, then twist left to unlock the housing.
- Lift the housing straight up and off of the computer. Carefully set it aside.
Mac Pro won't turn on when its cover is removed.
Mac Pro (Rack, 2019)
- Shut down your Mac Pro.
- Wait approximately 5-10 minutes for the computer to cool down.
- Unplug all cables except the power cord from your Mac Pro.
- Touch the metal housing on the outside of the Mac Pro to discharge any static electricity, then unplug the power cord.
Always discharge static before you touch parts or install components inside your Mac Pro. To avoid generating static, don’t move around the room until you finish installing memory and install the access door back onto the computer. - Stand your Mac Pro on its end.
- Push in the top of the latches, then pull the latches to remove the access door.
Remove DIMMs
Your Mac Pro ships with DIMMs preinstalled in some or all of the DIMM slots. Before you can install memory, you might need to remove some of the DIMMs to match a supported configuration or to meet mixed capacity R-DIMM installation requirements.
- Slide each lock to the left to unlock and open the DIMM covers.
- Remove the DIMM covers.
- Locate the DIMM(s) that you want to remove. Each slot is labeled with a number. Push down on the DIMM ejectors on each end of the DIMM, which slightly raises the DIMM out of the slot.
- Use your thumb and index finger from each hand to gently grip the DIMM at each end, then carefully remove the DIMM by pulling the DIMM straight out of the DIMM slot. Don’t twist or force the DIMM out of the socket or damage might occur.
- Place the removed DIMMs into an electrostatic discharge (ESD) protective bag.
Install DIMMs
- Locate an empty DIMM slot.
- If possible, use canned air to blow dust out of the DIMM slot. Keep the can vertical.
- Gently hold the DIMM ends and insert it into the slot. Make sure the DIMM is aligned with the slot before applying any force to insert it. When you insert the DIMM, make sure to follow these guidelines:
- Don’t force the DIMM. If the DIMM doesn’t insert, verify that the notch and connectors are aligned with the notch in the DIMM slot.
- Don’t rock the DIMM into the seated position.
- Don’t bend or twist the DIMM when you insert it.
- Insert the DIMM gently until the bottom edge of the DIMM is touching the gold contacts, then apply more force to fully seat the DIMM. The DIMM ejectors click into place once the DIMM is fully seated.
- Replace the DIMM covers. Push down on the left side of the covers until they click into place.
If you don't replace the DIMM covers, system performance may be affected.
Reinstall the housing or top cover
Follow the steps to reinstall the housing on Mac Pro (2019) or the top cover on Mac Pro (Rack, 2019).
Mac Pro (2019)
- Lower the housing over the Mac Pro.
- After the housing is fully seated, twist the top latch right and flip it down to lock it.
Top: Locked position (dots match)
Bottom: Unlocked position (dots do not match) - Connect the power cord, display, and any other peripherals.
Mac Pro (Rack, 2019)
- Reinstall the access door.
- Reinstall your Mac Pro into the rack.
- Connect the power cord, display, and any other peripherals.
Verify your memory
To check the status of your memory, choose Apple menu > About This Mac, then select the Memory tab.
If your DIMMs should be configured in different slots to maximize performance, macOS notifies you with recommendations for which slots to use for your currently installed DIMMs.
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Other configurations
If you want to test any single channel or the DIMM itself, you can use a 1 DIMM configuration by installing a single DIMM into the first slot of a channel. If you want to test the second slot of a channel, install DIMMs into both slots of a channel.
Learn more
- If you received a replacement part from Apple, follow the steps to send your original part back to Apple.
- Look up Mac Pro (2019) memory specifications.
- Learn about some of the PCIe cards you can install in your Mac Pro.
- Install and replace parts in your Mac Pro.
When a user wants to add or upgrade memory (RAM) in a computer, they need to know how many memory slots are available. The following section will help you to determine the number of memory slots in your computer, as well as how many are currently being used.
Windows Task Manager
The easiest solution for Windows users is to open the Windows Task Manager.
- Press the Windows key, type Task Manager, and then press Enter.
- In the window that appears, click the Performance tab (A), then select Memory (B).
- In the lower-right corner, the number of slots is displayed in the Slots used: section (C).
- As you can see, this computer has a total of four memory slots, although only two are currently being utilized.
Use the CPU-Z utility
Another way to get information about memory slots and details about the RAM currently installed on your computer, is to use the free CPU-Z third-party utility.
- Open an Internet browser and visit the CPUID website.
- On the left side of the screen, select your operating system.
- On the next page, select your preferred language.
- On the next screen, click the DOWNLOAD NOW! button.
- Once the download has finished, install it from your browser and open the program.
- Click the SPD tab at the top of the screen, and then click the down arrow in the Memory Slot Selection section.
- As you can see in the image above, all of the memory slots (in this case, four) are listed in the drop-down menu.
If you select a different slot from the drop-down menu, CPU-Z will tell you additional information about the RAM that is installed, or nothing if the slot is unoccupied.
How To Determine How Many Ram Slots Are Used
Examine the motherboard
Sometimes the best way to determine the available memory slots is to open the computer and examine the motherboard. Opening the computer is the best option if were unable to get the Windows Task Manager or CPU-Z to work.
Looking inside the case, the motherboard is the primary large circuit board. On most motherboards, the memory slots are located on either side of the CPU, and resemble what is shown below.
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Most computer motherboards have two, three, or four memory slots. Some higher-end motherboards have as many as eight. The motherboard in the picture above has no memory modules installed in any of its three slots.
NoteHow To Check How Many Ram Slots Are Used
Crown poker aussie millions results. If your computer has no memory slots available and you want to upgrade, you must remove and replace some of the existing memory.
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Additional information
Dell Memory Slots
- See our memory definition for further information and related links.