An Aggressive Overclocker’s Dream! Unboxing and Testing KLEVV BOLT V DDR5 6400MT/s 32GB Memory Kit with 34mm Tall Aluminum Heat Sink


As AMD and Intel’s two new processor platforms become more widespread, DDR5 memory prices are nearing a level that gamers find acceptable. DDR5 memory has evolved from the original 4800 MT/s to a standard 5600 MT/s clock speed, and there are now more economical high-speed options for DDR5 overclocking memory. KLEVV introduces the next generation “BOLT V DDR5 6400MT/s 16GBx2” gaming and overclocking memory, featuring a basic 34mm high aluminum heat sink, and available in three-speed variations of 6000MT/s, 6400MT/s, and 6800MT/s. It supports XMP 3.0 and EXPO overclocking configurations, making it a premium option for high-end gamers at an attractive price point.


  • Memory Capacity: 32GB (16GBx2)
  • Clock Speed: DDR5-6400
  • Timing: 32-38-38-78
  • Type: DDR5 UDIMM
  • Voltage: 1.35V
  • Heat Sink: Basic 34mm Tall Aluminum Heat Sink
  • Pin Configuration: 288 Pin
  • Dimensions: 137.8 x 34 x 8 mm
  • Warranty: Lifetime Limited Warranty

KLEVV BOLT V DDR5 6400MT/s 16GBx2 memory out of the box / simple aluminum heat sink is not afraid of tower fan interference

In the previous generation of standard clock DDR5-5600 UDIMM 16GBx2 memory, Kefu KLEVV utilized SK Hynix A-die chips, allowing the standard clock memory to have significant overclocking potential. For players looking to invest in a direct upgrade to higher clock speed memory without breaking the bank, Kefu has also introduced the new “BOLT V DDR5” memory, specifically designed for overclocking and gaming.

KLEVV BOLT V DDR5 6400MT/s 16GBx2 outer packaging, marked capacity, speed and Intel XMP 3.0.
The back of the package is the basic feature description.

KLEVV’s BOLT V DDR5 memory comes primarily in a dual-channel 32GB configuration (16GBx2), and offers three speed choices: 6000MT/s, 6400MT/s, and 6800MT/s. With a low memory voltage of just 1.35V, it’s compatible with both Intel XMP and AMD EXPO profiles.

The design of BOLT V DDR5 overclocking memory includes a basic aluminum heat sink enclosing the circuit board and memory chips, ensuring effective heat dissipation for both the onboard power management chip and the memory chips. The height of this heat sink is a mere 34mm, so there’s no need to be concerned about compatibility with CPU air cooling tower fans.

BOLT V DDR5’s space gray heat sink has been crafted into an elegant and tidy shape, with its lines forming an aesthetically pleasing design. The heat sinks on both sides extend and curve to the top of the memory, with protruding shapes at the sides to aid users in applying more force when removing or installing the memory. The high-quality heat sink is coupled with a black circuit board, creating a minimalistic and sleek appearance that stands out even without any RGB lighting effects.

KLEVV BOLT V DDR5 memory with a simple aluminum heat sink.
There are memory models and labels on the back.

The clock speed of DDR5 memory has seen substantial enhancements, along with an increase in storage density. Consequently, mainstream DDR5 memory primarily comes in a single 16GB capacity, and it utilizes dual 32-Bit sub-channels. Each DDR5 memory module actually contains two sets of independently addressable 32-Bit sub-channels, offering higher bandwidth for applications that demand extensive memory operations. Additionally, On-Die ECC (Error-Correcting Code) is employed to correct any data errors within the chips, ensuring the reliability of the data.

Regarding the DDR5 memory’s integrated power control chip (PMIC), the motherboard supplies the 5V operating voltage. The PMIC then converts this to 1.1V for VDD and 1.8V for VPP, which are the required operating voltages. When overclocking through the motherboard, the PMIC can supply a higher memory voltage, allowing for a stable overclocking clock speed.

The Line above the aluminum heat sink.
The heat sink is only 34mm high, so don’t worry about tower fan compatibility.

KLEVV BOLT V DDR5 6400MT/s 16GBx2 performance test

The memory performance test was conducted using an Intel Core i9-13900K processor and a ROG MAXIMUS Z790 HERO motherboard. The test primarily relied on the memory’s XMP parameters, while the BCLK: DRAM ratio (1:32) and Memory Controller: DRAM ratio (1:2) were left to the motherboard’s automatic settings.


Test Platform Details:

  • Processor: Intel Core i9-13900K
  • Motherboard: ROG MAXIMUS Z790 HERO
  • Memory: KLEVV BOLT V DDR5 6400MT/s 16GBx2
  • Display Card: NVIDIA GeForce RTX 4090
  • Cooling System: ROG RYUJIN III 360
  • Power Supply: Seasonic VERTEX GX-1000
  • Operating System: Windows 11 Pro 22H2

In the motherboard’s BIOS, the memory SPD information was inspected. The DRAM memory by KLEVV uses SK Hynix memory chips and supports XMP 3.0 overclocking profiles. The PMIC of the memory utilizes Richtek technology. The standard clock according to the JEDEC standard is set at 4800MHz with CL40 timing, and the XMP parameter is configured at 6400MHz with CL32 timing.

DRAM SPD information.
DRAM SPD information.

The KLEVV BOLT V DDR5 6400MT/s 16GBx2, configured with XMP settings of 32-38-38-78 at 1.35V, demonstrated impressive performance in tests: AIDA64 memory read speeds of 101774 MB/s, write speeds of 87280 MB/s and latency of 66.7ns. This performance is significantly superior to that of other newly released DDR5 memory, particularly at high clock speeds. The attractive timing configuration also contributes to better memory latency, making this memory module an especially strong option.

AIDA64 memory test.

PerformanceTEST, a computer testing tool created by PassMark Software, includes a variety of memory test metrics such as overall project score, database operations, memory read (with cache On/Off), memory write, latency, capacity, and memory allocation sequence.

The KLEVV BOLT V DDR5 6400MT/s 16GBx2 achieved a total score of 2756 points in this test, placing it at 53% in the total score ranking. This compares favorably to the average memory score in the PassMark database, which stands at 2621 points, highlighting the memory’s commendable performance.

PerformanceTEST memory test.

During the overclocking test of KLEVV BOLT V DDR5 6400MT/s 16GBx2, the process began with the JEDEC standard clock DDR5 4800 CL40, where the first-generation memory achieved read and write speeds of 76326 MB/s and 68180 MB/s, respectively. Moving on to the standard DDR5 5600 CL40, the memory read and write speeds improved by 13%. With this particular XMP set at 6400MT/s, the memory read and write performance reached 101774 MB/s and 87280 MB/s, marking a 33% increase in read speed and a 28% increase in write speed compared to the first-generation clock.

Upon maintaining the XMP parameters and pushing the memory clock to 6600MT/s, no significant issues were observed. However, to reach 6800MT/s, it was necessary to relax the timing to 40-40-40-77 and increase the voltage to 1.4V. Finally, when attempting to escalate the speed to 7000MT/s, relying on the original XMP parameters proved challenging. Instead, the Hynix 7600MHz 1.4V 2x16GB SR parameters from the ROG motherboard were applied, and the clock was set to 7000MT/s to successfully pass the test.

AIDA64 memory bandwidth test.

Regarding memory latency, the DDR5 6400 CL32 has a delay of 65.8ns, exhibiting better performance than the original DDR5 4800 and DDR5 5600. For stable use, gamers are recommended to keep the overclocking setting at either 6400MT/s or 6600MT/s. If there’s a desire to further increase the clock frequency, consideration should be given to either boosting the voltage or using the overclocking parameters supplied by the motherboard for experimentation and testing.

AIDA64 memory latency test.

By applying the Hynix 7600MHz 1.4V 2x16GB SR parameters from the ROG motherboard, and setting the clock frequency to 7000MT/s, a retest was conducted through PerformanceTEST. The memory performance soared to 4731 points, significantly surpassing the average performance in the database, and reaching the 99th percentile. This score ranks first overall.

The specific parameters set on the ROG motherboard for this test were:

  • BCLK: DRAM ratio of 1:35
  • Memory Controller: DRAM ratio of 1:2
  • DDR5 timing of 36-44-52-96
  • Voltage of 1.4V

This remarkable achievement demonstrates the robust capabilities of the KLEVV BOLT V DDR5 memory, particularly when optimized through precise overclocking configurations.

7000MT/s test.
CPU-Z 7000MT/s timing.
ROG BIOS Memory Preset parameter options.

In a stress test utilizing BOLT V DDR5 6400MT/s with XMP parameters, the memory was subjected to the Prime95 Large FFTs memory stress test. Running 24 workers under load for 30 minutes, the test was completed quite stably, with memory usage reaching 97.5%. The temperature of the SPD Hub on the memory module reached 67°C.

These results indicate that with proper installation and the basic heat dissipation airflow present in a standard chassis, sufficient cooling can be achieved. It underscores the memory’s stability and capability to handle intense loads, making it a reliable choice for gamers and power users.

BOLT V DDR5 6400MT/s stress test.


The KLEVV BOLT V DDR5 memory has received QVL certification from 4 major manufacturers and supports Intel XMP 3.0 and AMD EXPO overclocking profiles. Its elegant design includes a high-quality 34mm tall aluminum heat sink that not only ensures sufficient heat dissipation for maintaining high clock performance and stability but also poses no compatibility issues with tower fans. It presents a superior choice for players who prefer understated simplicity.

For overclocking the BOLT V DDR5 6400MT/s, turning on XMP to directly ramp up the speed to 6400MT/s is straightforward, and manually adjusting the clock frequency to DDR5 6600 CL32 is quite stable as well. To go beyond that, a higher voltage would be required. Hence, for general gaming, using XMP or a modest overclock to 6600 MT/s is recommended. If the goal is to overclock further and achieve higher scores, the motherboard parameters can be utilized to attain a lofty clock speed of 7000 MT/s.

Priced in Taiwan at $3399 for the BOLT V DDR5 6400MT/s 16GBx2 memory, this cost is quite competitive, especially when compared to the pricing of the first generation at launch. For those considering a new installation, opting for DDR5 memory should be a no-brainer, as it offers increased capacity, higher clock speeds, and doubled bandwidth, providing a more powerful and future-ready solution.

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Title: An Aggressive Overclocker’s Dream! Unboxing and Testing KLEVV BOLT V DDR5 6400MT/s 32GB Memory Kit with 34mm Tall Aluminum Heat Sink