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Post your RAMDisk speeds

El_Capitan

El_Capitan

[H]ard|Gawd
2FA
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Nov 11, 2012
Messages
1,476
I used Dataram RAMDisk, but decided to try out some others. I don't even know if they exist, anymore. You can do a 30-day trial with Primo Ramdisk, and AIM Toolkit is open source, but isn't very fast.

For these tests, I'm using 4x32GB DDR4 memory overclocked to 3600MHz at 18-22-22-42-2T at 1.35V's. Gear 1 and BCLK frequency at 100MHz. I set my RAM amount to ~64GB.
2026_05_14_CPU-Z_Memory.png

The fastest by far is Primo Ramdisk.
2026_05_14_Primo_RamDisk_CDM.png

My Dataram RAMDisk is version 4.4.0.36, but it's still not bad.
2026_05_14_Dataram_RamDisk_CDM.png

AIM Toolkit, an open source Ramdisk, was "slow"... at least compared to the others.
2026_05_14_Aim_Toolkit_CDM.png

For DDR5, 2x16GB DDR5 memory overclocked to 6400MHz at 36-48-48-104-1T at 1.35V's. Gear 2 (it's a cheap pre-built MB) and BCLK frequency at 100MHz. I set my RAM amount to 16GB.
2026_05_14_CPU-Z_Memory_DDR5.png

Primo Ramdisk:
2026_05_14_Primo_RamDisk_CDM_DDR5.png
 
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I love Primo Cache. been using it for years now. I don't use the Memory aspect. I use it with SSD's and mostly for write cache, almost completely negates the downsides of HDD's. It's a must if using big HDD's and doing lots of work with media on those drives. In general, the network is the limiting factor for me. I have a Fusion-IO drive caching my HDD pool that will write at full speed until the drive fills up and that means when I transfer files over 2.5gb network it pegs 280MB/s for the entire transfer. So that's why I don't use the memory part. Not really any extra benefit for my usage.

But I 100% advocate for Primo Cache!
 
westrock2000 said:
I love Primo Cache. been using it for years now. I don't use the Memory aspect. I use it with SSD's and mostly for write cache, almost completely negates the downsides of HDD's. It's a must if using big HDD's and doing lots of work with media on those drives. In general, the network is the limiting factor for me. I have a Fusion-IO drive caching my HDD pool that will write at full speed until the drive fills up and that means when I transfer files over 2.5gb network it pegs 280MB/s for the entire transfer. So that's why I don't use the memory part. Not really any extra benefit for my usage.

But I 100% advocate for Primo Cache!
Click to expand...
Yeah, I'm thinking of getting a 3-pack and maybe selling two for cheap when the RAMpocalypse is over. Right now the Dataram license and speed is good enough. I use a RAMDisk as a work area and cache for video editing. If I'm working on 4K and high bitrate, I set it to 64GB, so I have 64GB usable RAM leftover. I'm still limited by the length of 4K videos and the amount of RAM I have, but smaller videos are a blast to work with.
 
Is there a RAM disk utility for MacOS? Would be interesting to see how fast M5 Max 128GB 64GB RAM disk could write!

EDIT: looks like it can be done right from the terminal.
 
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