XFX Black Edition 850W

[misticx]

200$ nije u opste mnogo ako je tih 850W kvalitno

 

[illidan]

mozda i nije kvalitetno

The new XFX 850w PSU blew up twice in the OC3D review...

However, all is not well. Part of OC3D's PSU testing procedure involves a "MAX Load" test in which the PSU is placed under a continually increasing load which takes it outside of its rated specification. This not only identifies the true capabilities of the PSU (for example if it is a 750w PSU overclocked to 850w, or a 1000w PSU underclocked to 850w) but also ensures that the OCP (Over Current Protection) is fully functional on the unit. Unfortunately this is where the XFX failed in a BIG way.

During this test the load was increased to 22A on both the +3.3v and +5v rails and 62A on the +12v rail. This combined with the small load on the +5vSB and -12v rail equated to around a 970w load on the PSU (120w above rated output). At first, everything appeared to be working fine. The ripple results were perfectly acceptable, the exhaust temperature was around 65°C and the voltages were all well within spec. Around a minute later the PSU powered off. Nothing unusual there, OCP had kicked in and saved the day. To find out whether the unit would be capable of sustaining a slightly lower load, the +12v rail load was reduced to 61A and the PSU powered back on. What happened next warranted a change of underwear...

An EXTREMELY loud BANG (heard even two floors down!) was emitted from the PSU accompanied by a bright flash. Yes, the XFX Black Edition had failed in a potentially dangerous way. Luckily none of the OC3D equipment was damaged by the elaborate death of the XFX PSU, but it is extremely worrying that the OCP protection on the PSU didn't kick in for a second time. Of course this could be put down to the unit being from a faulty batch, but as the unit tested in the video was the 2nd one to suffer this exact fate at the hands of our MAX LOAD tests, something does indeed seem wrong.

ovde ima i video

 

[bungynik]

Ukakio se i seasonic..:flame: :flame: :flame: :flame: :flame:

 

[illidan]

imao je seasonic jedan problematican batch, ali to bese na pocetku m12d serija, cak mislim da su i menjali ljudima za ispravan napajanje. mozda su to utopili xfx_u

 

[Oki]

A ako se secjate josh sa onog foruma, prvi put se zaista povela negativna kampanja bash za LC napajanja kada su spamovali forum sa identichnim video materijalom.

Ne bih voleo da me pogreshno razumete ali negde izmedju se krije istina

 

[illidan]

razlika je sto je ovo eksplodiralo kada se opteretilo sa mnogo vise od snage koju daje, a lcp je eksplodiralo na mnogo manje nego sto pise

naravno OCP je trebao da odradi posao bas u ovakvom slucaju, zasto nije...

kog foruma? mozes slobodno da napises sa benchmark foruma

 

[bungynik]

Meni se cini da je opteretio napajanje tik ispod OCP margine... onda ne moze da odradi OCP a napajanje je preoptereceno. Mislim da je XFX(seasonic) pogresio sto nije definisao nizu OCP marginu i time na neki nacin sprecio da do ovoga dodje, a u radnom opsegu bi imao savrsene radne parametre... ali to je na seasonicu da resava... mada mislim da ovo i nije bilo neko veliko preopterecenje s obzirom da je ovo DC-Dc dizajn. nego nigde nisu o0bjavili sta je stradalo u napajanju!!!

 

[bungynik]

A evo i jos dodatnih informacija:

It's not OCP. It's either OPP (on the primary side) or OTP (usually monitoring secondary or transformer temperature). OPP cannot be very precise because the APFC output varies between 300V (at <120V input) and 380V (at ~220V input). Since OC3D tests AT 220V it's very likely that the primary current haven't exceeded the OPP point but the switchers are already overloaded.
itocp.com PSU editor

Stvarno ima logike to sto je rekao ovaj Kinez!! Sad kad malo bolje razmisli covek, sve navodi na to i sada ima smisla. Prvi zakljucak po rezultatima testa se nametao kao OCP problem, ali ovo sto je on napisao mnogo vise lici na potencijalni scenario, a i mnogo verovatnije nego OCP... mada nikad se ne zna, mozda je seasonic ovde dobro predriblao sebe!!!

 

[illidan]

Hi Guys, Im tinytomlogan one of the team from Overclock3d. We were all quite amazed at the response from this article this morning, Ive been meaning to join here for ages so thought this would be the best excuse I was going to get. (thanks to the modteam here for processing me quickly)

Anyways the XFX 850w:

Thanks for all your comments on the review. As many of you have already stated, OCP should have kicked in and prevented this from happening. Whether or not this issue is also present on the Seasonic M12D (almost identical internals to the XFX) I'm not entirely sure as our MAX Load testing was only recently introduced when we upgraded our load equipment capacity (from 900w on +12v to 2900w). What I will say is that every other PSU reviewed since this test was introduced has shut down safely when the maximum load it is configured for was exceeded. The Corsair HX850w for example powered down at anything above 1084w and the OCZ Z100M at anything above 1268W.

On another note we did also experience something slightly untoward with SCP too. Although I'm not sure of there is any specific behaviour that a PSU must adhere to with regards to SCP protection, the first XFX unit seemed far too keen to power back on again after we intentionally shorted it out. Most PSU's tend to require a hard reset after a short circuit (off at mains for a minute and then switch back on), but the XFX unit bounced straight back on again after the short circuit was removed (without even a power button being pressed).

Both units are now on their way back to XFX for inspection, and I imagine that they will want to investigate the problem with Seasonic before making any official reply on OC3D.

We will be asking both companies for more samples so we can conduct some more tests, only time will tell if they wish to participate.

sa XS, covek koji je u test timu OC3D

 

[bungynik]

Izgleda da nisu otvarali napajanje da pogledaju sta je crklo unutra. Kad sam u zaglavlju procitao ko pise nadao sam se da ce reci sta je crklo, ali nista. Verovatno cekaju reakciju XFX-a I Seasonica!