Which motherboard supports Resizable BAR best for Arc B570?

sooo i've been looking into the market data for these newer builds and honestly, i think you'll be super happy with how things are looking right now. i mean, i'm still kinda new to the deep technical side of bios modding, but i've spent hours researching brand reliability for my own arc project. basically, from everything i've seen, ASRock B650 Steel Legend WiFi is actually a sleeper hit for Re-Size BAR stability. asrock was one of the first companies to really lean into intel arc support, and their bios is super simple—literally just a couple clicks and you're good to go without worrying about boot loops.

if you decide to stick with the intel route, i would suggest the MSI MAG Z790 Tomahawk WiFi because msi has been really solid with their 'one-click' resizable bar toggle in the easy mode menu. i've heard some people say asus can be a bit finicky with keeping settings after a flash, but msi feels really rock-solid for a mid-range b570 setup. honestly, i'm just so satisfied seeing how much smoother battlemage is gonna run compared to alchemist... it works well when the motherboard actually cooperates! plus, the Gigabyte Z790 AORUS ELITE AX is another great option if you want something that feels premium but doesn't break the bank. just make sure you're on the latest bios version out of the box so the b570 is recognized properly. good luck with the build, hope it stutters zero percent lol! 👍

> I’m currently torn between an LGA1700 setup using a Z790 board or jumping over to an AMD AM5 platform with a B650.

Sooo, I just found this thread and I gotta say, sticking to a budget-friendly B650 is literally the way to go for a Battlemage build! I spent way too much on a fancy Z790 last year and honestly, the Re-Size BAR experience wasn't any better than my buddy's cheaper setup.

If you want the best value, check out the ASRock B650M Pro RS WiFi. ASRock is lowkey the GOAT for Intel Arc support because they actually partnered with Intel early on. Their BIOS is super simple—just one click and Re-Size BAR is ON without any wonky boot loops. Another solid choice is the Gigabyte B650 Eagle AX. It’s usually priced GREAT and their "Easy Mode" BIOS makes finding the 4G Decoding and Re-Size BAR settings a breeze. I've seen way fewer stability issues on these than some high-end boards. Just make sure ur on the latest firmware and youll be golden! gl with the B570!! 👍

sooo honestly, as someone who has been building rigs since the early PCIe days, you're right to be cautious. Re-Size BAR isnt just a 'nice to have' for these Arc cards—its literally mandatory if you dont want your games to stutter like crazy. I've seen way too many people lose performance cuz their BIOS reset after a power outage or a bad update and they didnt notice BAR was off.

Heres my take based on years of long-term data and some lessons I learned the hard way:

* **The Intel Route:** If you go with an LGA1700 board, you might want to consider going with MSI. In my experience, their menus make finding the Re-Size BAR toggle super simple. But be careful—you HAVE to make sure your Windows install is GPT, not MBR, or disabling CSM to enable BAR will literally stop you from booting.
* **The AMD Route:** Honestly, AM5 is actually very safe for this. I've found that ASUS boards on the B650 chipset have been extremely consistent with firmware updates not messing up these specific PCIe settings. Plus, their toggle is usually right there on the main 'Easy Mode' page.

Basically, I would suggest going with MSI for the most safety-first experience. Their BIOS is rock solid and rarely hides the toggle after a routine update. Just make sure to avoid any 'Beta' BIOS versions unless you absolutely need a specific fix, cuz thats usually where the stability goes out the window!! gl with the build, Battlemage should be a fun project.

sooo, Re-Size BAR (Resizable Base Address Register) is basically the PCIe tech that lets your CPU talk to the whole GPU memory at once instead of tiny 256MB chunks. For Intel Arc cards, it's honestly not even optional cuz the architecture relies on it to stop the memory controller from choking... performance literally tanks without it.

In my experience, I've had some really frustrating times with my current setup. I thought it would be simple, but after a firmware update, the setting just vanished and caused a wierd boot loop... super disappointing. Here's what I've learned from that mess:

1. Stick with a platform where the BIOS isn't a maze. I've found that some brands are way better at keeping the Re-Size BAR and Above 4G Decoding toggles in the same menu.
2. Make sure you disable CSM (Compatibility Support Module) immediately. If you don't, the BAR option usually won't even show up or it'll break your boot drive if it's not GPT.
3. Honestly, I'd lean toward the LGA1700 side for Arc. Since it's all-Intel, the handshake between the CPU and GPU is usually a bit more stable, tho AM5 is catching up.

Just be careful and maybe check for the latest stable (not beta!) BIOS before you start. gl!

Came here to say the same thing lol. Great minds think alike I guess.

Honestly, just a heads up—avoid older BIOS versions because I've had issues where Re-Size BAR actually disables itself after a CMOS reset. For Battlemage, I'd suggest going with ASUS or MSI on the B650 platform. Their BIOS menus are super easy to navigate, and the toggle is usually right on the front page. NGL, my experience with some budget boards was pretty disappointing cuz the settings were buried and buggy as hell. Definitely go AM5 if you want better long-term stability for that B570! gl