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2015年3月更新的 13 英寸 MacBook Pro 配备 Retina 显示屏，型号为A1502，采用第五代英特尔酷睿 i5 和 i7 处理器，并配备 Force Touch触控板。

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MacBook Pro 2015 13' Performance Drop

I own a MacBook Pro 2015 13’ with i5-5257U 2.7GHz CPU. Recently I found out that my MB won’t use more than 30 Watts of power even if it is connected to AC. When running Cinebench R23 or GFX Bench GL, the computer total power consumption keeps at around 30 Watts, sometime it peaks to 35W but only for 1 or 2 seconds.

My old battery was replaced by Apple with original one back in Nov. 2019, and the new battery is in pretty good shape, 99% battery health reported by CoconutBattery.

I cleaned the internal of the MB and reapplied the thermal paste with MX-4, the temperature during Cinebench R23 or any other benchmarking software stays around 80 Degree C with about 70% fan speed. This is far below the limit of thermal throttle. Score of Cinebench R23 around 1800 points. The GPU won’t go above 600 MHz under any situation, only in GFXBench GL it goes to 850MHz. But the internal Iris GPU is rated by Intel up to 1050MHz. CPU power draw during Cinebench is around 18 to 20 Watts maximum, significantly lower than data published by Intel (28W or aTDP 23W). In this review article the author even got 32Watts consistent power draw of the CPU alone (under Energy Management-Power consumption)https://www.notebookcheck.net/Apple-MacB....

I tried reset SMC, NVRAM and PRAM, nothing changed. Power supply is 60W, works normally, I don’t have other device to try it on so I can’t say if it is ok or damaged. I also tried to unplug the battery and PSU for 30 Mins to reset any possible chip.

I was running MacOS Big Sur 11.2.3 but it was too laggy so I downgraded, formatted the SSD and did a clean install of High Sierra with no TimeMachine involved because I stored my data on an external drive. On HighSierra is is a bit better than Big Sur.

I ran Apple Diagnostics, nothing found.

I also see no performance difference when the MB is running on battery or PSU (same power draw and co.), so I assume it could be a software issue limiting the performance of the MacBook? That the machine stuck at battery aka. low performance mode even it is connected to AC?

Could that be a faulty or failing Power Supply which caused those issues? Or failing DC-In board?

Or it is on software Level? .kext or SpeedStep issue? Firmware issue? Boot-Rom of my MBP is 426.0.0.0.0, SMC Firmware is 2.28f7.

It is sometimes painful to have that low performance, I would even get lags when I’m entering or exiting full-screen on YouTube or Netflix.

Anyone has an Idea how to solve this issue?

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What is the size of your SSD and how much free space do you have no it? Also what is the SSD make and model.

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@danj

I have 500GB of WD SN550 installed with 470GB free.Original SSD was a 128GB one and because I have all of my data on external drive I had also 85G+ free space. I still have Big Sur on my 128G SSD and I installed HighSierra on the SN550 so if I need I could swap the drive to get to BigSur.

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Little update:

A friend of mine who works in a repair shop checked my MBP and he suggested that could be a CPU soldering issue. Because at his workplace there’s a BGA Plattform and he do this quite much, he re-soldered the CPU for me. As he already disassembled the MB, I also let him do a RAM upgrade, changing 4x2GB modules to 4x4GB, although some resistances on the MB have to be removed. For roughly 120 USD and some beer I am getting 16GB ram and the performance like before. The MBP could definitely still last a couple of years.

Greetings.

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So you are force fitting an M.2 SSD into your system via an adapter. Sadly I often find these setups not stable and'/or don’t offer the performance people are expecting.

Sadly, its time to get either a real Allpe unit or one which is designed from the ground up to work properly in your system (OWC or Transcend) I fully understand its the costs. But if you want reliability and performance once you need to pay the piper!

Your performance limitation is all related to the SSD/adapter you are using.

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Well I also have a Transcend JetDrive which have 240GB storage. I also had HighSierra on it but no improvement, because of that I deleted the MacOS and made it a WTG via Thunderbolt. Also as I mentioned, original Apple 128G drive also have same issue. So I don’t think this could be a SSD problem. All three SSDs have no difference in terms of CPU performance or total energy draw. (Even if it is a SSD issue, all programs would be executed from ram, just like normal hard drives and SSDs, loading speed would be different but other things would be the same. Cinebench would not have different score no matter where it is stored.

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I want to add more information about this.

First of all, before I upgrade my SSD to a WD one I already did many research on Internet to see possible aftermaths, but most of the issues are sleep/wake related or PCI-E related (speed etc.) I found nothing related to performance drop.

I tried to tweak the settings using Volta and VoltageShift under MacOS, no success.

I tried to boot into Windows (with my Transcend JetDrive installed into my MBP, not WTG via Thunderbolt), I can’t tweak the settings in XTU or ThrottleStop, but I saw during Cinebench the CPU ist always EDP/ Current Limit throttled. So I guess it should, could, maybe, probably, be a firmware(EFI) issue which can’t be modified by user. Or it is just I am having failing VRM in my Mac or bad PSU.

I tried what I could to troubleshoot. Maybe I would just use my MBP as is and not bother solving this problem any more. I will buy a new DC-In board and a 85W PSU to see if these work.

Well, at least I won’t say from the beginning that it is caused by SSD.

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@mecrin - Sorry its not that simple! Modern OS's leverage caching and virtual RAM and depending on the app scratch space.

Your retina system really only has one variable here and thats the drive the RAM is fixed at what ever it is a 8GB system will use more of your drive for VRAM over a 16GB system.

But thats cool you have found something new which is not traceable. Sounds like you'll need to get your system to someone local who can dive deeper into what's happening. You're on a snipe hunt with all of your efforts your issue is not a VRM or EFI issue.

I've pulled out quite a few M.2 drives for many reasons putting in the proper drives. Every time I do it the performance comes back to where it should be.

My clients are advanced amateurs, media students and working pro's here in Boston. My experience in Mac's dates back to the original Apple IIe and I've serviced thousands of systems.

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