PCI Express Bandwidth Test: PCIe 4.0 vs. PCIe 3.0 Gaming Performance & Limited VRAM Memory...


Posts: 597   +500
We have to see. The cheapest 1650 on Newegg is $324 on Newegg right now but it performs a good bit below an RX 570.

So in the end what matters is a) street price vs performance and b) what you want to use the card for. We‘ll see very shortly.
GTX 1650 4GB GDDR6 have appeared on Amazon quite many times over the past few months. I've even managed to snap an Asus TUF Gaming OC model at around about 220 USD before taxes. There are cheaper models with no extra 6 pin power connector going for close to 200 bucks.
I expect the RX 6500 XT to run faster than the GTX 1650 GDDR6, but that is assuming the issue that the PCI-E bottleneck don't happen. I feel AMD engineers mistaken the Infinity Cache to be either really infinite or if they mistook the 16 MB as 16 GB that they decided to gimp the PCI-E to x4. To me, the problem is not that much the x4, but the fact is that you need at least a PCI-E 4.0 x4 for this card to somewhat perform alright. And yet, this is meant to be a budget card, which means most users are going to be using like a PCI-E 3.0 system. It is funny that AMD seems to be on top of backward compatibility for their CPUs, but yet have little consideration about backward compatibility on GPUs with this sorts of cutback. Sure, it will run alright, but with a significant performance hit.


Posts: 597   +500
I find it amusing that people genuinely believe that AMD was trying to do gamers a favour by cutting their costs and only bundling 4GB of VRAM with the 6500XT. The execs at AMD must be laughing like pirates!

It feels to me that AMD is trying to capitalise on the current GPU shortage situation to test and see how much cost they can cut before people start rejecting their products. While I feel they will certainly be able to sell these GPUs to OEMs which are in dire need for GPUs, but this is a very negative publicity to tech savvy people. And the worst case just like Nvidia, they like to paint a beautiful picture of themselves as knights in shining armour here to "save gamers". But in actual fact, it is always about their bottom line that they are concerned about. After all, they are profit seeking companies, but they should save their money by not marketing their pretence. In this case, it is like saying, "Let me find gamers some GPUs by making it so bad, that miners won't want it." Ironically, miners are getting the better cards.


Posts: 138   +93
The reason for this release is fairly simple. OEM's or system builders. They wont be packing a 2x00 series of CPU in there with only PCI-E 3.0 but a more modest 3x00 or even 5x00 series (AMD) or Intel equivalent with PCI-E 4.0.



Posts: 1,058   +863
I love AMD and Lisa Su long time PC builder and shareholder but I'm shocked she let this go through and who is that woman in that picture on stage? She new to AMD? If she was hired because of diversity and that stupid lib crap then I understand the stupid reason and path of this failure of a product.

Come on INTEL give us something! No matter what INTEL makes they really can't fail in this GPU market lol! Just wow with how politics are going in America and this,THIS HAS TO BE A BAD DREAM.

Aaron Fox

Posts: 153   +90
I wish reviewers will recall, when covering this debacle, that AMD chose to prematurely discontinue driver updates for Fiji cards during the chip shortage. I am the not-so-proud owner of a Fury X that should be more performant but has been locked out of contention since July.

Those parts are faster than these terrible 4GB things being unleashed into the market like AMD's management is just as crass and duplicitous as it was with the FX 9000 series CPUs.

Tech enthusiasts should never forget how much those cost and how they were sold on nonsense. Motherboards that caught fire were only part of that joy. The famous overclocker 'The Stilt' said that GF would have had to send the chips that became the 9000 series to the crusher for having leakage that exceeded even the low expectations specification of first-generation Piledriver. Instead, AMD created a new much worse spec, a CPU that cost something like $600 in 'back then' money, and companies like AsRock gave us motherboards that caught fire.

The 'Polaris Forever' strategy was bad enough (a device used to inflate prices with Nvidia and consoles) but now they're actually releasing parts weaker than weakened Polaris? Oh, the inhumanity of corporate love.

Aaron Fox

Posts: 153   +90
In my opinion, there is nothing wrong with 4GB VRAM cards, especially if the price is right.
Large gaming companies have a special relationship with chip makers like Nvidia and AMD. It is in their interest to inflate VRAM requirements. Is it accidental that some of the games tested require just over 4GB—just enough to cause problems?

A good developer would be sure to make it possible to have medium settings fit into 4GB. But money talks.

It talks enough for AMD to release something as outrageous as these things, things that don't even take advantage of old PCI-e 3... things worse than Polaris, which wasn't impressive when it debuted.

The GPU situation for gamers can be summed with one word: facepalm.


Posts: 2,074   +1,654
AMD taking another dump on consumers in order to save a few dollars on manufacturing. Everyone who ends up with a 6500XT is going to end up hating Radeon/AMD when they get it home and get hit with dire performance alongside the usual Radeon driver issues. AMD fans should be upset that this abomination is being unleashed unto the unsuspecting public and inevitably tarnishing their own brand.


Posts: 258   +132
What we learned - do not ever buy a 4GB card. Honestly can't believe it's a thing in 2022 on a card with RRP of $200US. Even worse the 64 bit bus of the 6500XT is a sad pathetic joke IMO. I'm amazed the 6400 doesn't have a 32 bit bus, 2GB, and 4MB IC.

No, what we've learned is gimping a card by reducing it's buses bandwidth will cripple a 4GB card. Give a 4GB card a full PCIe 3.0 16x slot's bandwidth and it's still quite viable for the majority of games, as long as you're willing to dial the visuals back of course.

This is simply the time honoured tradition of gimping entry level cards to the point where they're useless for gaming, and has been going on since both Nvidia and AMD started producing different tiers for each generation. Usually it was by giving the entry card a ridiculously low memory bus speed making utilizing the card's VRAM impossible. I guess they couldn't do that this time and limited the PCIe bus speed instead.

So IMHO it's not the reason to avoid cards with only 4GB of VRAM, and more the reason why gamers should always avoid the lowest tier cards. Again IMHO those cards are meant more for OEM builders so they can say their systems come with a genuine AMD/Nvidia craphics card then anything else...


Posts: 900   +1,175
I'm wondering how much influence infinity cache has on this. Theoretically, it should reduce data transfer over the PCI-e bus, so, the performance drop should be reduced.

Additionally, there might be an unusually large difference between resizable bar enabled and disabled for this card. You should test that too.
This was entirely wrong apparently xD


Posts: 44   +16
"It’s been widely reported that the 6500 XT is restricted to PCI Express 4.0 x4 bandwidth" This statement in the review implies 8GB/sec bandwidth restriction not a lane restriction which is very different.

This review is much to do about nothing. Chicken little and the sky is falling when its not.

Pci 3.0 x 4 = 4 GB/sec which yes since 2012 that can bottle neck.

But no one runs their cards at that speed because all the MBs since 2012 or so have had PCi2.0x 16 (8GB/sec) or PCI 3.0 x 16 = 16 GB sec.

They are comparing 4GB/sec to 8 GB/sec and yes in a 4GB card the slower 4GB/sec transfer can bottle neck if you run out of VRAM nothing new here folks.

Lets say you have a B450 Pro4 MB (Their example of horror) as its only PCIx 3.0.
That board has 2 PCIe 3.0 x16 slots. Or each slot does 16GB/sec not 4GB/sec so why would you run your card at 4GB/sec when the MB supports 16GB/sec ????

6500 XT is restricted to PCI Express 4.0 x4 bandwidth (8GB/sec) In their testing they did not use 8GB/sec on PCIe 3.0 x 8 they used PCIe3.0 x 4 (4GB/sec) Why would they do this?

Anyone that has a older 2012 PCI 3.0 MB it can do PCIe x 8 (8 GB sec) and even PCIe 3.0 x 16 = 16 GB/sec.

Real test should have been PCIe 4.0 x4 = (8GB/sec) vs PCIe 3.0 x 8 = (8GB/sec) then you have apples to apples.

Again those older MBs can all do PCIe 3.0 x 8 and PCIe 3.0 x 16 so why test at PCIe 3.0 x 4?????????????????

The new AMD card is limited to 8GB/sec on PCI slot. Most any MB made from 2012 to newer can do that.

The Sky is not falling. Unless..........

Their initial statement is in error and rather than a bandwidth limitation its a physical lane restriction. That is far different.
If the card were to only have 4 Physical lanes. Then you are looking at a physical connection restriction and not bandwidth. So then you need to look at what 4 lanes delivers on various MBs.
4 lanes
PCIX 5.0 = 16 GB/sec
PCIX 4.0 = 8 GB/sec
PCIX 3.0 = 4 GB/sec
PCIX 2.0 = 2 GB/sec

Anything 8 GB/sec and higher does not seem to hurt or bottle neck performance.
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