G.SKILL
G.SKILL Flare X5 Series DDR5 RAM (AMD EXPO) 64GB (2x32GB) 6000MT/s CL30-40-40-96 1.40V Desktop Computer Memory U-DIMM - Matte Black (F5-6000J3040G32GX2-FX5)
Bottom line: The G.SKILL Flare X5 Series DDR5 RAM ($1,299.99 on Amazon as of 2026-10-31 04:20 UTC): 64GB from just two 32GB DIMMs, which keeps the build to a simpler two-module setup; main trade-off: boots at the slower JEDEC speed until you enable EXPO in BIOS.
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Complete build that uses this part: Dual Radeon AI PRO R9700 Workstation: 64 GB Local LLM Build (Memory) — see the full parts list for the rest of the build.
This part is in Dual Radeon AI PRO R9700 Workstation: 64 GB Local LLM Build: $3,002.39 for 5 of 6 parts, including this part (GPU (×2) not included — no current Amazon price; case not in this list — add your own), at Amazon prices checked or later (price may vary). 🛒 Add the 5 priced parts to Amazon cart
*Price sourced from Amazon.com. Last updated 2026-10-31. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 64GB from just two 32GB DIMMs, which keeps the build to a simpler two-module setup
- ✓ DDR5-6000 at CL30 primary latency, a tight timing for this speed
- ✓ AMD EXPO profile reaches the rated speed with one BIOS toggle
- ✓ Listed for AMD X870, X670, B850, B840 and B650 platforms
- ✓ Matched 2x32GB pair designed and binned to run together as a set
Cons
- ✗ Boots at the slower JEDEC speed until you enable EXPO in BIOS
- ✗ Hitting 6000MT/s depends on your specific CPU and motherboard
- ✗ Can't be mixed with other kits, so a later upgrade means a new matched set
- ✗ Non-ECC, so not suited to builds that need error correction
Manufacturer description
The G.SKILL Flare X5 Series DDR5 RAM kit (F5-6000J3040G32GX2-FX5) gives your AMD desktop 64GB of memory across two 32GB U-DIMM modules. It is rated for DDR5-6000 at CL30-40-40-96 and 1.40V. Many AMD builders aim for CL30 timing at 6000MT/s, and this kit includes an AMD EXPO overclock profile, so you reach the rated speed by changing one BIOS setting. G.SKILL lists the kit for AMD X870, X670, B850, B840 and B650 platforms. At default BIOS settings the modules boot at the slower JEDEC SPD speed. Turn on EXPO (some boards call it DOCP or A-XMP) to run the rated 6000MT/s profile. Whether it runs…
SpecPicks Verdict
SpecPicks scored G.SKILL Flare X5 Series DDR5 RAM (AMD EXPO) 64GB (2x32GB) 6000MT/s… using a rating × review-volume × price-fit model applied to published specs and reviews across the memory (ram) category. G.SKILL's memory (ram) lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for memory (ram) of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Will the G.SKILL Flare X5 64GB kit run at 6000MT/s right out of the box?
No. It boots at the JEDEC default SPD speed with default BIOS settings. To run DDR5-6000 CL30-40-40-96 at 1.40V, enable the AMD EXPO profile (some boards label it DOCP or A-XMP) in BIOS. Stability at that speed depends on your motherboard and CPU.
Which motherboards is this DDR5 kit compatible with?
G.SKILL lists AMD X870, X670, B850, B840 and B650 platforms. For validated motherboard models, check the G.SKILL memory QVL or the RAM Configurator tool on the G.SKILL website.
Can I add this kit to the RAM I already have?
G.SKILL advises against it. Kits are sold as matched sets designed to run together, and mixing kits can cause instability or system failure. If you need more capacity, buy a single matched kit at the total size you want.
Is this ECC memory, and does it work in laptops?
Neither. It is non-ECC DDR5 U-DIMM memory with 288-pin modules, built for desktop PCs and gaming systems. It does not fit laptops, which use SO-DIMM slots.
What do the CL30-40-40-96 timings and 1.40V mean?
These are the kit's rated EXPO settings: CAS latency 30, then 40-40-96 for the other primary timings, at 1.40V and 6000MT/s. The voltage and timings apply automatically when you enable the EXPO profile. Running outside G.SKILL's specifications can cause instability.
Key Features
- G.SKILL Flare X5 Series DDR5 U-DIMM Memory Kit, Model: F5-6000J3040G32GX2-FX5
- 64GB total capacity kit containing 2x32GB modules, rated for up to DDR5-6000 CL30-40-40-96 at 1.40V
- Non-ECC, DDR5 U-DIMM, 288-pin, for Desktop PC & Gaming
- Includes JEDEC default profile, and AMD EXPO memory overclock profile
- Do not mix memory kits. Memory kits are sold in matched kits that are designed to run together as a set. Mixing memory kits will result in stability issues or system failure.
- For AMD X870, AMD X670, AMD B850, AMD B840, AMD B650 platforms. Refer to G.SKILL memory QVL or RAM Configurator tool on the G.SKILL website for more details on validated motherboard and hardware.
Full Specifications
| Brand | G.SKILL |
|---|---|
| Voltage | 1.4 Volts |
| RAM Size | 64 GB |
| Model Name | Flare X5 Series |
| Form Factor | High Performance Desktop |
| Memory Speed | 6000 MT/s |
| Model Number | F5-6000J3040G32GX2-FX5 |
| Compatibility | PC |
| Item Type Name | DDR5-6000 |
| Number of Pins | 288 |
| Mfr Part Number | F5-6000J3040G32GX2-FX5 |
| Memory Generation | DDR5 |
| Compatible Devices | Desktop |
| Data Transfer Rate | 6000 MHz |
| Memory Form Factor | UDIMM |
| Additional Features | DDR5 SDRAM U-DIMM AMD EXPO |
| Computer Memory Size | 64 GB |
| Warranty Description | Limited Lifetime Manufacturer |
| RAM Memory Technology | DDR5-6000 |
| Column Address Strobe Latency | 30 |
Hardware benchmark data
Ready to buy?
G.SKILL Flare X5 Series DDR5 RAM (AMD EXPO) 64GB (2x32GB) 6000MT/s CL30-40-40-96 1.40V Desktop Computer Memory U-DIMM - Matte Black (F5-6000J3040G32GX2-FX5) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-31. Price and availability subject to change.
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