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Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W

bogdanzieba 9417 11
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  • #1 17156684
    bogdanzieba
    Level 29  
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    Hello, I plan to mount the following set graphics card Sapphire Radeon HD 7870 XT With Boost (11199-20-20G) :

    1. MSI B250M PRO-VH motherboard;
    2. Intel Pentium G4560 processor, 3.5GHz, 3MB;
    3. GoodRam DDR4 PLAY memory 2 x 8GB, 2400MHz, CL15 RED (GYR2400D464L15S / 8G);
    4. XFX Core PRO 450W power supply (P1-450S-X2B9);
    5. Blue SATA III 7200RPM 500 GB hard drive, WD5000AAKX;
    6. DVD drive.

    The XFX Core PRO 450W power supply (P1-450S-X2B9) has a 1x6 pin power supply, while the graphics card needs 2x6pin power supply.

    My question is what better adapter to use:

    1.1 molex for 6pin
    Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W

    2.1x6pin to 2x6 pin
    Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W

    The rating plate of the power supply looks like this:
    Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W

    The manufacturer added two 1 molex to 6 pin adapters to the card.
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  • #2 17156944
    KSRhaziel
    Level 36  
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    bogdanzieba wrote:
    [b] The manufacturer added two 1 molex to 6 pin adapters to the card at the factory.

    Depends on what outputs you have on the power supply. It will be best to connect each power supply on a separate "line", which is why the manufacturer gave two adapters - assuming that someone will not have 6pin, only molexes.
  • #3 17156981
    bogdanzieba
    Level 29  
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    So it's best to connect this one 1x6pin line from the power supply and the other to make from a 6-pin molex adapter?
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  • #4 17157283
    dt1
    Admin of Computers group  
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    The power supply has one 12V line and thick cables. It also has a lot of molexes, so I would connect it to 2x MOLEX -> 6 pin selecting molex plugs on two separate beams. Use the other plug without any modifications straight from the power supply.
  • #5 17157496
    bogdanzieba
    Level 29  
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    Thanks for the answers. So @ dt1 you say it's better to give a 2molex - 6pin adapter for this?
    Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W
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  • #6 17157826
    dt1
    Admin of Computers group  
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    Yes, I would use it with a power supply with enough molexes.
  • #7 17157853
    bogdanzieba
    Level 29  
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    Like the manufacturer attached to this card two adapters:
    1molex - 1 connector 6 pin.
  • #8 17158006
    dt1
    Admin of Computers group  
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    Theoretically, the load capacity of the molex plug is 11A per line, i.e. ~ 130W. Given that the card is still powered by a direct cable from the power supply, an additional cable from a single molex can also handle it.
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  • #9 17158018
    bogdanzieba
    Level 29  
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    And what would the hypothetical load capacity look like if I used such an adapter: 1x6pin to 2x6pin:
    Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W
  • #10 17158031
    dt1
    Admin of Computers group  
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    The theoretical load capacity of PEG 6pin is 75W, PEG 8pin is 150W, in practice certainly much more (since Molex can handle over 130W on one wire, and in PEG we have three 12V wires). Especially on a decent power supply with cables, but in which there is more metal than insulation, there should be no problems.
  • #11 17158053
    bogdanzieba
    Level 29  
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    The graphics card Sapphire Radeon HD 7870 XT With Boost (11199-20-20G) needs 185W, so it's better not to risk with a 1x6pin to 2x6pin adapter:

    Sapphire Radeon HD 7870 XT Power Supply: 2x6 Pin Adapter for MSI B250M PRO-VH & XFX Core PRO 450W
  • #12 17158056
    dt1
    Admin of Computers group  
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    For my it will do, but considering that the power supply has a lot of molexes, and a 2x molex-> peg grommet for pennies can be bought or sometimes even free. On the other hand, the plug from the power supply plus a grommet from a single molex, if you already have one, it is also enough.
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Topic summary

✨ The discussion revolves around the power supply requirements for the Sapphire Radeon HD 7870 XT graphics card, which necessitates a 2x6 pin power connection. The user is considering two adapter options: a 1x6 pin to 2x6 pin adapter and a 2x Molex to 6 pin adapter. Responses suggest that using the 2x Molex to 6 pin adapter is preferable due to the power supply's ample Molex connectors and the need to distribute the load across separate lines. The graphics card requires 185W, making it risky to rely solely on a single 1x6 pin to 2x6 pin adapter. The consensus emphasizes the importance of using multiple power sources to ensure stability and adequate power delivery.
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FAQ

TL;DR: Molex 12 V lines are rated ~11 A (~130 W); “an additional cable from a single molex can also handle it.” Use the PSU’s native 6‑pin plus one Molex‑to‑6‑pin for the Sapphire HD 7870 XT. [Elektroda, dt1, post #17158006]

Why it matters: This helps builders safely power a 2×6‑pin GPU on a PSU with only one PCIe connector.

Quick Facts

Whats the best way to power a Sapphire HD 7870 XT with an XFX Core PRO 450W?

Use the PSUs native 6‑pin for one GPU socket. Create the second with a Molex‑to‑6‑pin adapter. Pick Molex plugs from two separate harnesses to spread load. “Select molex plugs on two separate beams.” This balances current on the single +12 V rail. [Elektroda, dt1, post #17157283]

Is a 1 76 pin to 2 76 pin splitter okay for this card?

It can work, but prefer the native 6‑pin plus a Molex‑to‑6‑pin. The PSU has many Molex outputs, and dual‑Molex adapters are cheap. “For me it will do,” yet using Molex harnesses avoids stressing one PCIe lead. Thats the practical recommendation here. [Elektroda, dt1, post #17158056]

How much power can a single Molex plug deliver?

Approx. 11 A per 12 V line, which is about 130 W. With one Molex adapter plus a direct PSU cable, the GPU power path is sufficient. “The theoretical load capacity of the molex plug is 11A per line.” [Elektroda, dt1, post #17158006]

What are the PCIe PEG connector limits I should design to?

PCIe 6‑pin is 75 W. PCIe 8‑pin is 150 W. “In practice certainly much more,” but follow spec when planning wiring. On a decent PSU, “there should be no problems” when you route cables sensibly. [Elektroda, dt1, post #17158031]

Will a 450 W XFX Core PRO handle Pentium G4560 + HD 7870 XT?

Yes. With a decent unit and thick cables, there should be no issues powering this setup. Keep one native PCIe 6‑pin and use one Molex‑to‑6‑pin as advised. “There should be no problems” with proper cabling. [Elektroda, dt1, post #17158031]

Do I need to use both included Molex to 6 pin adapters?

No, not with this PSU. Theyre provided so each GPU plug can be fed from separate lines when a PSU lacks PCIe leads. “Best to connect each on a separate ‘line’,” which explains why two adapters are included. [Elektroda, KSRhaziel, post #17156944]

How should I choose which Molex connectors to use?

Use Molex plugs from two different harnesses (“beams”). This distributes current and avoids stacking load on a single peripheral chain. Quote: “Selecting molex plugs on two separate beams.” This matches the PSU’s single‑rail design and thick cabling. [Elektroda, dt1, post #17157283]

Can I run both GPU 6 76 pins from one peripheral chain?

Avoid that. The guidance is to feed each required plug from a separate line to distribute current. The manufacturer packs two adapters anticipating this need when PCIe leads are missing. “Connect each… on a separate ‘line’.” [Elektroda, KSRhaziel, post #17156944]

If I only have one free Molex, is that still okay?

Yes. One Molex‑to‑6‑pin can handle the extra feed because the other GPU plug is powered directly from the PSU. “An additional cable from a single molex can also handle it.” Keep wiring tidy and secure. [Elektroda, dt1, post #17158006]

Is a dual Molex to 6 pin adapter better than a single Molex one?

Yes, if your PSU has enough Molex plugs. “Yes, I would use it with a power supply with enough molexes.” It shares current across two connectors on the peripheral side. That adds margin under load. [Elektroda, dt1, post #17157826]

How do I wire this safely? (3 steps)

  1. Plug the PSU’s native 6‑pin into one GPU socket.
  2. Use a Molex‑to‑6‑pin for the second socket.
  3. Select Molex plugs from two separate harnesses (“beams”) to spread load on the single +12 V rail. [Elektroda, dt1, post #17157283]

Does splitting one 6 76 pin into two increase available power?

No. One 6‑pin is still a 75 W spec feed. A 1×6‑pin→2×6‑pin splitter does not raise that capacity. For a 185 W class card, prefer the native 6‑pin plus a Molex‑to‑6‑pin. [Elektroda, dt1, post #17158031]

What is the HD 7870 XTs approximate power draw?

Approx. 185 W for the Sapphire Radeon HD 7870 XT With Boost. Size your cabling and connector plan around that draw. Use one PCIe 6‑pin plus one Molex‑to‑6‑pin as discussed. [Elektroda, bogdanzieba, post #17158053]

Are the XFX Core PRO 450W cables robust enough for this setup?

Yes. The unit has a single 12 V line and thick cables noted by contributors. That supports the recommended Molex‑plus‑PCIe cabling approach. Follow the separate harness guidance for best results. [Elektroda, dt1, post #17157283]
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