Predator PO3-655: RAM DDR5 5600 works on 4400 and power supply voltage drops

overcrate
overcrate Member Posts: 5

Tinkerer

edited November 26 in Predator Desktops

I have bought Predator PO3-655 DG.E45EG.00G. Stock 2 x 8gb Apacer DDR5 5600 supports JEDEC#9 and JEDEC#10 (2800 MHz) and should perform @5600 MT/s, but it works only @4400 MT/s. It is intalled according to the manual in DIMM1 and DIMM2 (the second and the fourth slot with respect to CPU). BIOS 1.02 have no options to manage RAM frequency neither XMP.
I have read on the forum that it should work @5600 MT/s. What should I do to make it work @5600 MT/s?
Another problem that the CPU I7 14700F has Current/EDP limit throtling for 60% of time without load (I think 12 V line voltage drops) and also locked for max power @135W. Acording the techical data for PO3-655 DG.E45EG.00G the power supply is 750W. The 750W power supply should not behave like this.
Even if I change radiator I will not be able increase power limit to the processor to 219W to have maximal performence in the future because of Current/EDP limit throtling. Acording to the tests CPU performance is 60% of its maximal. I think it is because of the power limits and DDR5@4400.

I think my PC has some sort of deffect either the ajustments is not ok((

Best Answer

  • overcrate
    overcrate Member Posts: 5

    Tinkerer

    edited November 28 Answer ✓

    Thank you for the answer.

    I have added photos in the end.

    RAM:

    Frequency 2194.6 MHz (DDR5-4390) - Ratio 1:22
    Timings 36-36-36-70-106-2 (tCAS-tRCD-tRP-tRAS-tRC-tCR)
    Module Apacer Technology 8192 MB (DDR5-5600) - P/N: GD3.48453H.001

    PC:

    Predator Orion 3000

    Model: PO3-655
    Part: DG.E45EG.00G



    [Edited the thread to hide sensitive information]

Answers

  • Puraw
    Puraw ACE, Member Posts: 14,152 Trailblazer

    Hi, the actual RAM controller clock speed for the Acer Predator Orion 3000 PO3-655 with DDR5 RAM is 4800 MT/s, it may clock down to 4400 MT/s if not in Dual Channel mode. The CPU supports Up to DDR5 5600 MT/s.

  • StevenGen
    StevenGen ACE Posts: 12,512 Trailblazer
    edited November 26

    The Predator PO3-655 14th Gen cpu is designed to operate with memory Up to DDR5 5600 MT/s and Up to DDR4 3200 MT/s type ram and NOT at max DDR5-4800MT/s. Make sure that you have the latest bios version 1.02 installed for the cpu fix of the intel 13th and 14th Gen stability problems and see if that also will improve the ram speed.

    Otherwise, the reason that your ram is running slower, is because you are using the wrong ram type. so I suggest that you use the oem ram listed below that Acer has tested this desktop with and recommends as the type of ram to be used. Good luck and hope this helps you out.

    The Predator Orion PO3-655 has the following memory specs and Acer lists the following ram modules to be used with this desktop:

    If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

  • overcrate
    overcrate Member Posts: 5

    Tinkerer

    Thank you for the answer.
    I am totally agree with you that it should work like this according to the datasheet.
    CPU-Z shows that RAM is working Dual Channel. If I put only one RAM in DIMM1 I have also 4400 MT/S. If I insert 2 RAMs in one canal for example in DIMM1 and DIMM3 I have 4000 MT/S. CPU-Z shows Single Channel.
    Seems like the BIOS locks the speed @4400 MT/s.

  • brummyfan2
    brummyfan2 ACE Posts: 28,605 Trailblazer

    Hi,

    Could you please post the model name and the number on the RAM modules, the details are on the label on the RAM sticks.

  • overcrate
    overcrate Member Posts: 5

    Tinkerer

    edited November 27

    Thank you for the answer.
    Actually Acer installed the RAM into the system so it should be tested. My stock RAM equipped with metal radiator with Predator logo like on your picture but it is not in the list. If you need I can make photos later.
    My BIOS is already updated to 1.02 but it has not improved the RAM speed. It is still 4400MT

  • georgehenry776
    georgehenry776 Member Posts: 1 New User

    Your issues seem related to system limitations or potential defects.

    1. RAM Speed Limited to 4400 MT/s

    • Many prebuilt systems lock RAM to JEDEC speeds without XMP support.
    • Check if the motherboard supports 5600 MT/s and update the BIOS if available.
    • If manual settings for RAM frequency are accessible, try configuring them.
    • Contact Acer if the specs confirm 5600 MT/s but it doesn’t work.

    2. CPU Throttling and PSU Voltage Drops

    • The 750W PSU might be faulty; check the 12V rail stability using HWMonitor or a multimeter.
    • Prebuilt systems often limit power; the 135W cap might be BIOS-locked.
    • Ensure proper cooling to prevent additional throttling.

    Next Steps

    • Run diagnostics to verify PSU/motherboard health.
    • Contact Acer for support or warranty service if the issues persist.
      Let us know how it goes!

  • overcrate
    overcrate Member Posts: 5

    Tinkerer

    edited November 28 Answer ✓

    Thank you for the answer.

    I have added photos in the end.

    RAM:

    Frequency 2194.6 MHz (DDR5-4390) - Ratio 1:22
    Timings 36-36-36-70-106-2 (tCAS-tRCD-tRP-tRAS-tRC-tCR)
    Module Apacer Technology 8192 MB (DDR5-5600) - P/N: GD3.48453H.001

    PC:

    Predator Orion 3000

    Model: PO3-655
    Part: DG.E45EG.00G



    [Edited the thread to hide sensitive information]

  • billsey
    billsey ACE Posts: 34,682 Trailblazer

    Here's the board layout:

    And here are the slot numbers:

    The the picture above you have memory installed in DIMM1 and DIMM2. They should be installed using this:

    So you are good with the placement. I have no idea why it's not running at full speed. I am of the opinion that the 655 model doesn't support XMP overclocking because they removed that function as an incentive for users to purchase at a higher price the 650 which does support it, but I could very easily be wrong there. I have no actual insight into their marketing. The CPU power limits are based on the cooling design. If they allowed users to increase the TDP above what their cooling design can handle there would likely be issues. Again, the higher end machines do have some visibility into tweaking for higher performance than their entry level Predator gaming machines.

    Click on "Like" if you find my answer useful or click on "Yes" if it answers your question.
  • overcrate
    overcrate Member Posts: 5

    Tinkerer

    edited November 27

    When I have a feedback from Acer support I will write here what they answer.
    I understand that stock CPU cooling system cannot remove 220W. I planned to buy 6 pipe coolling system and obtain nice system in a small box.
    If they locked RAM speed and CPU TDP I will return PC I will return the PC.