News Arc A770 Loses 25 Percent Performance Without Resizable Bar

[Admin]

Media outlet TechPowerUp evaluates the performance impact that PCIe 3.0 and Resizable Bar have on Intel's Arc Alchemist graphics cards.

Arc A770 Loses 25 Percent Performance Without Resizable Bar : Read more

 

[Alvar "Miles" Udell]

Intel's site doesn't list support for Windows 7 nor 8, making 10 20H2 the minimum OS.

 

[escksu]

Hmm.... intersting...

I am wondering if there is actually alot more performanc could be unlocked from this feature. Esp. with PCIE 4.0/5.0 since the CPU could write to graphics card RAM much faster.

The performance loss from Arc shows that this feature could have a big impact on performance. Maybe we are seeing very minimal gains on AMD/Nvidia cards because the GPU is not designed to take advantage of this.

 

[The Historical Fidelity]

Hmm.... intersting...

I am wondering if there is actually alot more performanc could be unlocked from this feature. Esp. with PCIE 4.0/5.0 since the CPU could write to graphics card RAM much faster.

The performance loss from Arc shows that this feature could have a big impact on performance. Maybe we are seeing very minimal gains on AMD/Nvidia cards because the GPU is not designed to take advantage of this.

I was thinking that too. AMD and Nvidia’s designs are biased toward the normal 256 MB standard since they have been building their designs well before re-bar came about. Since re-bar was released with the pci-e 3 standard but has only just now been utilized by AMD to edge out a win against nvidia then nvidia scrambling to get it to work with their 3000 series, it stands to reason that rebar inclusion was not a design requirement. Since Intel has a fresh start designing a micro-architecture, it makes sense that they would make the arc design reliant upon the newest cpu-vram interface.

 

[jkflipflop98]

Intel's site doesn't list support for Windows 7 nor 8, making 10 20H2 the minimum OS.

....so?

Steam's stats say 7 and 8 combined account for 3% share. 10 and 11 garner 96.69% of the Steam base. Which is currently 24M accounts.

 

[KyaraM]

....so?

Steam's stats say 7 and 8 combined account for 3% share. 10 and 11 garner 96.69% of the Steam base. Which is currently 24M accounts.

Some people really love their old, long depricated OS...

Windows 7 was great, but people really need to move on at one point. You also simply can't implement backwards compatibility until anno dacumal. That's a lot of work. People already complain about Intel drivers and say they should have done less and added features over time, and now they want OS backwards compatibility into the early 2000's? Come one, one or the other.

(Edited for typos)

 

[The Historical Fidelity]

Some people really love their old, lomg depricated OS...

Windows 7 was great, but people really need to move on at one point. You also simply can't implemwnt backwards compatibility until anno dacumal. That's a lot of work. People already conplain about Intel drivers and say they should have done lwss and added features over tume, and now they want OS backwards compatibility into the early 2000's? Come one, one or the other.

Where’s my Windows ME support Intel…Geez

 

[InvalidError]

ReBAR isn't a "technology like SAM", it is the generic PCI-SIG name of the PCI feature and SAM is nothing more than AMD's house rebrand, just like FreeSync is AMD's house-brand for its implementation of VESA's Adaptive Sync.

 

[eye4bear]

I am running an Intel 10th gen chip, however I also am running Linux (kernel 5.19 up to date), you know the forgotten step-child, no mention if these work on Linux?

 

[wifiburger]

it's not just older system as per the article
rebar / sam requires dx12 / new vulkan

So any dx11 or older API there's no rebar and will show performance loss unless Intel fixes this issue

 

[spongiemaster]

it's not just older system as per the article
rebar / sam requires dx12 / new vulkan

So any dx11 or older API there's no rebar and will show performance loss unless Intel fixes this issue

Why would you think this is an issue? One would have to think that Intel knew what they were doing all along and didn't just coincidently develop an architecture optimized for SAM.

 

[InvalidError]

I am running an Intel 10th gen chip, however I also am running Linux (kernel 5.19 up to date), you know the forgotten step-child, no mention if these work on Linux?

AFAIK, Intel has only announced Linux support for the brand-new kernel 6.0, which basically means no direct support from Linux vendors until their next releases assuming they weren't feature-locked to 5.xx before 6.0 got announced.

 

[wifiburger]

Why would you think this is an issue? One would have to think that Intel knew what they were doing all along and didn't just coincidently develop an architecture optimized for SAM.

it's an issue because dx11 have terrible FPS because they optimized only for rebar operation
and like I said rebar can't be used with older API

 

[setx]

How article's author can be so incompetent and write so much misinformation? Besides what was pointed out:

Regarding ReBAR, only Intel 10th Generation Comet Lake, 11th Generation Rocket Lake, and 12th Generation Alder Lake processors support that feature.

ReBAR on Intel can work since PCI-E 3 support, i.e. Ivy Bridge! With minimal troubles on Linux. On Windows official support started from 300-series motherboards but there are manual working hacks for as early as Ivy.

 

[shady28]

I am running an Intel 10th gen chip, however I also am running Linux (kernel 5.19 up to date), you know the forgotten step-child, no mention if these work on Linux?

There's a review on Phoronix running under Linux. I believe they go over Linux kernel requirements.

https://www.phoronix.com/review/intel-a750-a770-arc-linux

 

[bit_user]

which basically means no direct support from Linux vendors until their next releases assuming they weren't feature-locked to 5.xx before 6.0 got announced.

That's not true. Major distros are typically on kernels up to a couple years old, and they deal with new hardware by backporting support for it.