Difference Between GDDR6 Vs GDDR6x (Full Comparison)

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NVIDIA Ampere video cards were the first to use GDDR6 Vs GDDR6x, graphics memory, which is the performance step up from GDDR6. They were able to match the 21 Gbps of capacity that we had at the time thanks to this storage, but they did so in a novel fashion that offers several benefits. and some drawbacks. Was it worthwhile to make the change? Let’s have a look at it.


GDDR6X uses 15% less power per transmitted bit than GDDR6, but because GDDR6X is quicker than GDDR6, total power consumption is greater. PAM4 is quicker than NRZ and uses less power and pins than differential signaling. High Bandwidth Memory is expected to be more expensive than GDDR6X.

Difference Between GDDR6 Vs GDDR6x

Where Does GDDR Memory Come Into play?

GDDR memory is utilized in graphics processors and is employed in 3D modeling, video editing, graphic design, mixing, and even gaming, as its name suggests. Data that is required by the processor core for processing is cached in any sort of RAM, whether it is System RAM or Visual RAM.

You can consider RAM As A High-Speed Storage system with the drawback of volatility, which means that if the power, goes off, all data is gone. The VRAM will store scene data for 3D rendering, which will be accessible by the Display Engine.

The VRAM will also be used in gaming to store scene data such as animations, colors, models, lights, and other items that the GPU will need to depict the present state of the Tournament and Players.

What’s The Difference Between GDDR6 Vs GDDR6x?

No one can deny that the GDDR6X symbolizes a significant improvement over GDDR6 graphics memory in many ways, so if anyone had any doubts, they can now be dispelled: in terms of results, the GDDR6X is superior, but this is the reason why NVIDIA has taken the risk of including it in its Ampere layout graphics cards, nothing more, nothing less.

Is Comparing GDDR6 Vs GDDR6x Graphics Memory Worth It?

The first graphics cards to use GDDR6X graphics storage, which is faster than GDDR6, were NVIDIA Ampere. Thanks to this memory, they were able to compare the 21 Gbps of capacity that we had at the time, but they did so in a unique way that offers a lot of benefits… and problems. Is making a change worthwhile? Let’s have a look at it together.

GDDR6X graphics memory, as previously stated, is not a JEDEC specification, but rather a Micron Innovation design that enables you to realize new levels of efficiency. We won’t go into the advantages and disadvantages of holding exclusive rights to a product; instead, we’ll consider whether switching to GDDR6 was a good decision.

What Sets GDDR6X Apart From GDDR6?

No one can deny that the GDDR6X is a major advance over GDDR6 graphics memory in many aspects, so any questions are now eliminated: the GDDR6X is superior in terms of productivity, which is why NVIDIA took the risk of putting it in its Ampere design graphics cards, no more, no less.

Micron got this performance improvement by using PAM4 encoding instead of GDDR6’s NRZ coding, which is currently in use in network devices. PAM stands for Pulse Amplitude Modification, and it generates various binary values by modulating the duration of an electrical pulse.

As a consequence, whereas NRZ programming can only produce ones and zeros per clock period, PAM4 can produce four binary data per clock cycle, enabling it to encode two bits instead of one per cycle, thereby twice the width band.

Regardless of the reality that PAM4 encoding permits GDDR6X memory to have twice the speed of GDDR6, it is still limited to 21 Gbps. So, what’s the point of it? They have the same capacity but at a slower speed, which offers several advantages:

  • There is a decrease in the quantity of heat generated
  • Consumption is decreasing
  • There has been a decrease in the quantity of voltage
  • The amount of time that can be spent overclocking has been increased
  • They could be able to increase productivity by a ratio of two

Micron claimed to have reinvented memory with this new method, and NVIDIA has thrown a lot of money behind something. Of course, it has enormous potential, and you can obtain previously unheard-of memory levels.

Is It Advantageous For You To Upgrade To GDDR6x?

In addition to the one already mentioned, adopting this form of graphics memory has several technical drawbacks, including the fact that Micron manufactures it solely, thereby controlling its pricing and the production of (So, GDDR6X is now more expensive and harder to come by than GDDR6X originally was).

We’ve already established that the PAM4 encoding generates four binary values for each clock cycle, allowing for the encoding of two bits every cycle as opposed to one with the NZR encoding.

This elevates the importance of the voltage controller, and a flaw in its responsiveness could result in memory mistakes, generating at the very least read/write mistakes in the VRAM and resulting in artifacts, hangs, blue screens, and other issues.

This isn’t to suggest that the GDDR6X won’t have memory problems; far from it; it just means that it will be considerably more sensitive to them and dependent on the controller. The good news is that this disadvantage is largely countered by the fact that it operates at a voltage level and produces less heat.

To answer the issue of whether the transfer to these new memory devices was worthwhile, the answer is, of course, yes. Though it is not presently exploiting its full performance potential, there is the ability to double memory bandwidth, and they have already enabled significantly lower consumption and heat generation, both of which are significant benefits.

Now, only time will tell what destiny holds for VRAM. NVIDIA has a lot of potential with this form of RAM, but we’re still waiting for AMD’s response, as they’ve made their promises as well. NVIDIA, on the other hand, was a pioneer in the use of GDDR6X, but we must not remember that AMD was a forerunner in the use of HBM memory, which eventually proved to be a disaster.

GDDR6 Vs GDDR6X Gaming

In essence, GDDR6X uses less electricity but is quicker to the point where it consumes more power than GDDR6. Additionally, GDDR6X offers a higher data transmission rate of 21 GB/s. Over GDDR6, it has around a 43% data boost. Furthermore, GDDR6X runs significantly hotter than GDDR6.

Is GDDR6x Worth It?

GDDR6X is a huge performance boost over GDDR6, even if it is once again exclusively used by the priciest Nvidia GeForce GPU models. It features an increase of roughly 43% over GDDR6, a 21 Gb/s per pin data rate, 84 GB/s device bandwidth, and 1 TB/s system bandwidth.

Is GDDR6x Better Than GDDR6?

Overall, GDDR6X is more economical with power, but its increased speed means it consumes more juice than GDDR6. The information transmission rate of GDDR6X is higher, clocking in at 21 GB/s. It provides around 43% more data than GDDR6. GDDR6X is likewise significantly hotter than GDDR6 while in use.


We observe a large performance improvement with each generational progress in VRAM, and this was certainly the case with the upgrade among GDDR6 Vs GDDR6x. However, they are beginning to show signs of decreasing returns in key elements of their performance.

Will these declining returns be worsened as VRAM technology advances, or will fresh and interesting breakthroughs keep the pattern of a 50% – 100% increase inefficient information rates going?

Frequently Asked Questions

What are the benefits of GDDR6X?

In addition, GDDR6X consumes less power. GDDR6X utilizes 15% less energy per bit at 21Gb/s than GDDR6 at 14Gb/s. Micron states that the GDDR6X per-pin data throughput of 21Gb/s translates to a total memory capacity of 936GB/s when all pins and main memory are combined on a GPU like the RTX 3090. That’s enormous.

Is GDDR6X a decent gaming memory?

If you want to play 1080p games or sports titles, either 4GB or 6GB of graphics RAM would suffice. Demand will only rise when the next production of consoles gains more memory, thus the more GDDR6 you can obtain your hands-on, the better.

Why is GDDR6 so costly?

These processors are usually quite pricey because of their tiny graphics storage volumes and exceptional performance attributes. However, in a severe undersupply situation, this is a liability because the price of GDDR6/GDDR6X DRAM has skyrocketed. Large contract customers are generally served first by memory producers.

Is 8GB of GDDR6 sufficient?

In 2021, 4 GB of specialized VRAM in graphics cards should be the basic minimum. However, 8 GB is currently the industry standard for most GPUs, and it’s what you should strive for if you want a graphics card that will last in the future and/or if you plan to buy a 1440p or 4K monitor.

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