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Four black DDR5 sticks with matte heat spreaders, 288 pin, 64GB each

G.SKILL

G.SKILL Flare X5 256GB (4 x 64GB) DDR5 6000 CL36 desktop RAM F5-6000J3644D64GX4-FX5

SKU CH-AJBZ-A945D MPN F5-6000J3644D64GX4-FX5

Four 64 GB modules deliver 256 GB of DDR5 6000 with CL36 timing and AMD EXPO support for Ryzen platforms

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 6000 (PC5 48000)
  • CAS latencyCL36
  • Memory timings36-44-44-96
  • Rated voltage1.25 V
  • Buffer typeUnbuffered / Unregistered
  • Massive 256 GB capacity from four 64 GB modules
  • DDR5 6000 speed with CL36 latency for responsive performance
  • AMD EXPO profile enables rated speeds on compatible Ryzen platforms
  • Low 1.25 V voltage reduces power draw and heat
  • Black heat spreader keeps modules cool during heavy workloads

High-capacity DDR5 kit

This 256GB kit contains four 64GB DDR5 modules rated at 6000 MT/s with CL36 timings. The kit operates at 1.25V and includes AMD EXPO profiles for automatic configuration on compatible platforms. Black heat spreaders cover each module for thermal management.

AMD platform builders

The kit targets Ryzen systems using 600-series, 800-series or newer chipsets such as B650, B850, X670 and X870. Users who need only 64GB total or who run Intel platforms should consider different kits. Mixing this kit with other memory is not supported and can cause instability.

288-pin DDR5 form factor

Each module uses the standard 288-pin desktop layout and runs as unbuffered, non-ECC memory. The motherboard must provide four DDR5 slots and support the 6000 MT/s data rate with EXPO to reach rated performance.

How it compares

Measured against everything we stock in Desktop RAM, at today’s prices. Recalculated every night.

Price $5,434.99
Pricier than about 91% of the 3,647 comparable items (median $90.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 99% of the 3,251 comparable items (median 16 GB).
Price per GB $21.23 per GB
Pricier than about 90% of the 3,251 comparable items (median $6.75 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameG.SKILL
Product lineFlare X5
Model nameF5-6000J3644D64GX4-FX5
Total capacity256 GB (4 × 64 GB)
Product type288-Pin PC RAM
Product colorBlack
Performance
Rated speedDDR5 6000 (PC5 48000)
Memory
CAS latencyCL36
Memory timings36-44-44-96
ECC supportNo
Buffer typeUnbuffered / Unregistered
Kit configurationDual Channel Kit
Memory profilesAMD EXPO
Heat spreaderYes
Power
Rated voltage1.25 V
Size & build
Shipping weight0.20 kg
Package size217 × 142 × 20 mm
Compatibility
Recommended forAMD 600 Series / AMD B650 / AMD B850 / AMD Ryzen Compatible / AMD X670 / AMD X870 / High Performance or Gaming Memory
More details
LED lightingNone

Questions about this item

Will this 256 GB kit work on an AMD B650 motherboard with a Ryzen CPU?

Yes, the kit is validated for AMD 600 Series, B650, X670, B850 and X870 platforms. Enable the AMD EXPO profile in BIOS to run at DDR5 6000 CL36 1.25 V.

Can I add a fifth 64 GB module later to increase capacity?

The kit is a matched four-module set rated for dual-channel operation. Adding another module would break the matched configuration and can cause instability.

What do the timing numbers 36-44-44-96 mean for real-world use?

They are the primary latencies: CAS latency 36, RAS-to-CAS delay 44, RAS precharge 44 and cycle time 96. Lower values give snappier response in gaming and heavy workloads.

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