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The RMX has better Ripple suppression, better capacitors, better fan, better transient response, in cable capacitors (which some people hate), along with a few other minor differences . For a workstation, I don't think It would matter all that much. They are both great units. Price is a significant consideration here. If the savings are substantial, the RM makes a lot of sense. If the savings are insignificant, I would lean towards the RMx.

Everything LukeSavenije says here is either untrue or out of context. The S12II does have undervoltage protection. Myself and another poster have pointed this out to him previously and even linked to reviews confirming it. He has himself referenced reviews showing working UVP on S12II derivatives. So why he keeps repeating this is a bit of a mystery. The S12II NEVER hits 5.4 volts on the 5v rail under any know load condition. He was told this by someone else. That person was wrong and so it he. Again, I have previously informed him of this, but he keeps repeating it anyways. Finally, the one out of spec load he does correctly describe occurs only on a maximum minor rail crossload with next to no 12v load. This is NOT a real world load scenario. It's like putting a car on a dyno and simulating 7000 rpm at 5mph.

I would go with the CX. It's better than MWE and there Isn't enough information on the GD available at this time.

Except I'm not wrong. And I glad you mentioned this because there is a REASON I object to this nonsense. A couple weeks back a guy with an S12II 620 came here looking for advice on a new GPU. He wanted to know if his PSU could handle it. This was NOT a new build. He was just upgrading the GPU, which was fine with his setup. He was immediately descended upon by posters trying to convince him that his system was going to blow up and he should buy a System Power 9 or Pure Power 11. It's one thing to argue that the System Power 9 is better for a NEW build, but this guy already had a perfectly good PSU in the same class. You guys were trying to convince him to basically waste $60-80 based on a completely nonsensical narrative. Being that far off the mark when its just a theoretical exercise is one thing. Convincing people to waste their hard earned money is something else. Sixty to eighty bucks is a lot of money for some people. That's not cool.

No. It's supposed to trip before a hazardous electrical fault occurs. Exceeding the ATX ripple spec for less than 10w at a 150w overdraw is not a hazardous electrical fault. This unit performed perfectly fine. Be honest, I don't feel super good about that one either, but it's not enough to justify not ever using it. This is tier list, not a personal preference list. I don't buy EVGA at all. I have my issues with them and this type of quality control is one of those issues. That said, its still a 1 in 10,000 issue and the G3 is still one of the best units out there. Of course I can prove it. Like I said, it's competitive with the low end DC to DC designs, like the Pure Power 11, and System Power 9. And they win one category by default. What chance do think a unit without that advantage is going to have? I haven't done it to date because I don't think you guys really want to know. I mean how have you guys gone 2+ years believing this nonsense? At some point, someone should have asked themselves how Seasonic developed their amazing reputation when their best selling unit was over the past 15 years is supposedly an "office grade" unit. You should have asked yourselves why Antec, XFX, Corsair, and PCP&C, all had such great reputations when using it. Not to mention the excellent pro reviews. Something should have clicked, but it didn't because you really didn't want to know. BUT......if you are genuinely open to the idea that you might have been wrong all this time.....I will make the case. But the idea that you were misled for 2 years isn't an easy pill to swallow. Trust me. I have been there.

jrivers010, I think the problem is the tier list, not you. One reason I tell people to ignore tier list and do their own research is that such lists tend to be compromised in a number of ways, particularly personal bias. Case in point are these three units. I have SERIOUS issues with the way things are assessed by LukeSavenije and a few others on this forum. Their conclusions are not necessarily shared by the greater enthusiast community. Lets have a look, shall we: 1) The Seasonic Focus issue with shutting down with big time GPU's was a real issue that did occur, but it was infrequent, limited to a few GPU's, and has been corrected in more recent iterations., The alleged "ripple" issue he referenced occurred during an overload test of a 750w Focus near the 900 watt mark. In fact, the issue only occurred right before shutdown. At 888 watts, the ripple was 50mv. It then shut down at 900 watts. Any load that high would trip the OPP before the ripple could manifest itself. So its a complete non-issue. 2) The EVGA G3 had a couple of hard shutdowns during an overload tests. While that was not a pleasing outcome at all, sticking it in tier D based on that is nonsense. It has excellent overall performance 3) The Seasonic S12II and M12II still have a strong case for being the best best budget PSU's out there. Seasonic hasn't dumbed it down at all. It's still just as rugged and reliable as ever. Now it does have some impressive competition, particularly from the Corsair CX and BitFenix, and many now take the view that independently regulated units are always better options. But tier D, with about 18 group regulated units in Tier C? That is absolutely ridiculous. The S12II is probably the best group regulated unit ever made. Just as a case in point, the FSP Raider (the original version) is listed as tier C. The S12II beats it up, take its lunch money, and steal its girlfriend, and it does it in almost EVERY CATEGORY. But somehow he thinks the Raider is Tier C while the S12II, Focus, and G3 are tier D. If the S12II can do that to the Raider, imagine what the G3 and Focus would do to it. And this is FAR from a comprehensive list of problems with the tier list.

If you are going to spend that much more on your PSU, then consider the Corsair RM550x. It's currently on sale at Newegg for $79 after rebate. It's a significant upgrade in quality over the Be Quiet for about the same price: https://www.newegg.com/corsair-rmx-series-rm550x-cp-9020177-na-550w/p/N82E16817139231?Item=N82E16817139231

That's par for the course in this forum.

Why not continue using the XFX Pro? If the System 9 400w will do the job, so would the XFX. Just save your money and roll with it until the finances improve.

No, that is accurate for DC to DC as well. The Minors are still drawing from the same pool. If there is no draw on the minor rails, the whole 400w will usually be available for the 12v. If the minor rails draw significant load, it reduces the available 12v power. This of course assumes the unit rated 100% accurately. If the unit is over spec'd, then it could do max for both, but that could be true for non-DC to DC too.

A .367 volt deviation under full 12v crossload isn't great by modern standards, but isn't bad either. Its inside 3% and well inside the ATX spec of 5%. That also only occurs under MAX 12v crossload load. A typical M12II 620 with little to no minor rail load will maintain 1% regulation to around 300w, then 2% to around 450-500w. Then 3% the rest of the way. The lower wattage units do even better than that. Personally, I would never use any psu that close to its rated power level anyways. When I use the 620, it is for systems with a projected load of 500w or less, and preferably 450w. But remember, this is but one category that no group regulated unit will ever win against a more modern platform with DC to DC. But its like a carburetor vs Point fuel injection. Fuel injection is a HUGE advantage along with more modern vehicle tech. BUT while a 1975 Corvette can't compete with a 2019 Corvette, it CAN compete with a 2019 Corolla which will have cost cutting measures in place to compete at a certain price point. Likewise, the other budget units the M12II is competing against have corners cut in the name of costs. Corners that the M12II/S12II don't cut. You have weight the complete unit performance, not just one category. It depends upon your definition of "working properly". I would argue the point of OPP is to prevents things from blowing, not to maintain a certain voltage spec. And it didn't blow. The unit cruised through it like it was going to a birthday party. This is also a good example of why you prioritize real world performance over lab results. The point of lab tests is to PREDICT real world performance, not substitute for it. It did what it was supposed to do. The fact that it didn't do it at a point the review would prefer doesn't change the fact that is does work effectively. Safety hasn't been a problem for this model in 15 years. It not going to suddenly start being a problem just because of a few OCD reviews and forum posters. And we aren't just talking about 15 normal years. People have been loading the crap out of these units the whole time due to their reputation and they STILL held up. That is a 130w minor rail crossload. That is NOT a real world workload. Many units today don't even support that much on the minor rails. That's like sticking a car on a dyno and simulating 7000 rpm at 5 mph. And excellent example of a lab-only or VERY niche scenario. Group regulation implemented here does EXACTLY what it was expected to do. Produce decent to good regulation in real world load scenarios. People should stop acting like Group units run at a maximum minor rail crossload all day long. They don't. The sequential voltage regulation tests are pretty close to what group units do in real world performance, contrary to the to the prevailing narrative on this forum. At least the good ones do. This particular unit did fail the transient test for the minor rails, BUT if you weren't cherry picking negative results you would have noticed that their are four other S12II based models on that site that were also tested. Each passed all the transient test with solid results, including two other examples of the 620w, suggesting that this unit may not have been operating correctly. Here are the two 620's that passed. Notice the consistency of the results between them: Rebranded as an Antec HCG 620 https://www.techpowerup.com/review/antec-hcg-620m/7.html Rebranded as an PCP&C Silencer III 600 https://www.techpowerup.com/review/pc-power-cooling-silencer-mk3-600w/7.html Additionally, it's fairly common for units in the budget category to struggle with this test. Here are three examples of commonly recommended units on this form. These were NOT cherry picked. They were the first results I found and were performed by the same reviewer as the above units. All failed: The CX450 (the Great Wall model) https://www.tomshardware.com/reviews/corsair-cx450-psu,5678-8.html The Be Quite U9 500 https://www.tomshardware.com/reviews/be-quiet-system-power-u9-500w-psu,6035-4.html The Be Quiet Pure Power 700 https://www.kitguru.net/components/power-supplies/aris-bitziopoulos/be-quiet-system-power-u9-700w-psu-review/8/ In fact, the two rebranded M12II 620's outperform all three units. Remember earlier when I mentioned cost cutting to target the budget market? You can check that box here. That extra dough you dish out for the higher end models like the RMx actually does amount to improved performance. You can't just throw DC to DC on the secondaries and expect high end performance. These are budget units and they act like budget units.

You realize that "bug" was originally a hardware term, right? It was ported over to software, but it applies to hardware too.

I was referring to the FSP. I can't imagine a 2003 model being worth using over the current CX. Like I said, the M12II is a bit of a unicorn. But even then, it's only a budget unit now.

To believe that, you would also have to believe that the M12II EVO in 2013 was a random name change. They made it full modular when it was originally, only semi-modular. It also appears to me that they retuned the voltage regulation a bit.

No, because that unit sucks. The S12II is an unusual example. Very unusual, in fact. It's the only group regulated unit I will use.

Actualy, it is how it works. Platforms mature, have bugs worked out over time, and have features added. The M12II is better than it was at launch without question. Perhaps you meant relative to the competition or contemporary standards?

Because it works reliably and safely. One of the nice things about a mature platform with a 15 year history is that we know how it performs in real world usage. We don't have guess based on lab tests and conjecture. Real world performance is a more reliable indicator than lab tests. The Focus and its issues are a good example of this. It looked great in tests, didn't it? The fist review did have a crossroad test. And 12v did not behave as you describe. I have several others if you would like to see them. They don't behave that way either. The 12v is very stable on that series. And why do you keep saying it doesn't have undervoltage protection. It does.

I don't worry about minor rail crossroad unless it goes out spec on low wattage. If a 40/0 split on the minor rail knocks it out of spec, that would worry me. How often are really going to get a max load on the minor rails and nothing on the 12v that isn't a lab test? The 12v crossroad is the one to worry about, and it looks great. Where the M12II really earns its keep is ripple suppression, build quality, and reliability. Which in my opinion are all best in class Plus it can run at 50c without breaking a sweat. Everything in the budget category is a hodgepodge of compromises. The M12II is no different. The question is WHERE do you compromise? If you want the whole package, you have to spend more money.

Did you actually post this with a straight face? Do you even begin to fathom how ill-informed you have to be to write that? And ill-informed is being generous. The M12II opens up a can of whoopass across the board on the VS series. It's not even close, nor was it ever intended to be. The VS series was never meant to compete against the M12II. It targets a lower end market. So what? I have a 2018 review if it makes you feel any better, but the numbers are pretty much the same. The S12II/M12II have only gotten better over time. It's the same platform. Seasonic doesn't just carry brand names along. No it doesn't. Once again, I can tell that someone has never read an M12II review before. Intel REQUIRES it? Violation? You realize that the intel ATX specs are non-binding right? They aren't a government agency. Plus it has been violated in perpetuity. It's not the EVO. That came out in 2013, but the performance is very similar. I'm not sure exactly what they did, but the voltage regulation seems to have been tuned up a bit. There are a LOT of M12II/S12II reviews out there but only a couple done of the M12II after the release of the EVO. Here is one in Chinese from 2013 that covers the EVO: https://translate.google.com/translate?sl=auto&tl=en&u=https%3A%2F%2Fwww.expreview.com%2F26961-3.html Here is another from 2018. http://www.f14lab.com/2018/01/review-seasonic-m12ii-evo-620-beta.html?m=1

I'm not as high on the RM as I am on the RMx. If that is the regular RM, I probably go with the Seasonic Focus.

I'm inclined to agree. BitFenix is an intriguing PSU

Your rig built itself? That's extremely impressive!

Not all cases. There is some cheap stuff out there if you look hard enough.

The way you are describing the problem is a bit.....how shall I say it.....confusing. Could you walk us through your issue a bit more slowly and with more detail, so that we might better understand the issue. Now Spotty asked a question that piqued my interest as well. You said the systems power fell below 300 watts. How exactly did you make that determination? Do you have your system attached to some sort of power meter?

I'm in complete agreement with you about semi-passive. Just keep it spinning. Low speed 120mm+ are all near silent at low speed.