Forum: Jak najlepiej uzyskać 8pin do karty graficznej? (adapter)

Jak najlepiej uzyskać 8pin do karty graficznej? (adapter)

Być może ktoś z Was już kombinował. Mam wolne 2 x 6 pin (pci) i 1 x 4 pin (p4) + oczywiście molexy. Karta potrzebuje 1x6 + 1x8 i pytanie jak najlepiej je uzyskać nie wymieniając przy tym zasilacza. Z tego co dotychczas czytałem, najlepszą opcją jest przejściówka 2 x molex do 1x8 pin. Podobną przejściówkę dołączali producenci do kart graficznych i zasilaczy ale 1x6 pin zamiast 8. Karta to radeon 290x. Ma ktoś z Was doświadczenie w temacie? Dzięki

Faktycznie - 2xmolex -> 8 pin pci-e to najlepsze rozwiazanie. Upewnij sie tylko ze skorzystasz z molexow z nieuzywanego toru zasilacza.

tutaj najciekawsze na co trafiłem, wbrew temu co pisze internet. Faktycznie bardziej jestem skłonny uwierzyć, że dodatkowe, opcjonalne 2 piny to uziemienie a nie podwojenie mocy (musze w to wierzyc:D):

"First off, it's always better to have more, or at least heavier gage, ground wires than hot wires in a DC circuit. Not sure if you've ever dabbled in high end car audio, but we do it in car stereos all day long. Remember: Even though we use the term "positive" and "negative", DC electrons actually flow from an area of negative charge to that of a positive charge.

So does an extra ground wire or two allow the connector to support more current? Sure.

Now also remember what the PCI-SIG specification actually is for the 8-pin PCIe. It really only suggests ONE extra ground for increase current. The 8th pin is actually for a +12V sense. What's supposed to happen is as current increases, resistance increases and voltage drops (V = I*R). The +12V sense is supposed to feed voltage information back to an IC in the PSU and tell it when the +12V drops out of spec. The PSU is then supposed to compensate for that resistance with an increase in voltage at the source.

For whatever reason, the +12V sense as it's laid out in the PCI-SIG specification for 300W graphics cards hasn't been implemented by a single PSU manufacturer (added cost? Market is tough enough as it is to make any money). They just put in an extra ground to "trick" the graphics card into thinking the sense is there. No actual current is flowing through this eigth wire (fifth ground wire).

Can the 8-pin PCIe connector as it's implemented today really deliver TWICE the power of a 6-pin? No f'ing way... but that's ok. Because not a single card on the market meets or exceeds even the 75W per connector specification of the 6-pin and the additional ground does seem to help enough in delivering more current (if needed). And fortunately, graphics cards are getting more efficient despite becoming more powerful, so there may never be a need for a +12V sense on a PSU."

informacyjnie, dla potomnych: adapter 2xmolex -> 8 pin pcie spisuje się dobrze. Probowalem tez 2x6pin jednak obraz sie nie wyswietlal.