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Old May 28, 2009, 09:37 AM
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Default HD 4850 128bit vs HD 4770

I ordered Powercolor HD 4850 on sale. It is in back order. But, I found out that it has 128 bit DDR memory bus. The HD 4770 also has 128 bit but, QDR and it performs just a bit below HD 4850 256 bit DDR. So, did I make a mistake ordering the Powercolor HD4850 128 bit bus? I have it in good sale, $114 (included $20 rebate), and it is now selling for $160. Here is the link:

NCIX.com - Buy Powercolor Radeon HD 4850 625MHZ 512MB 1.98 GHz GDDR3 PCI-E VGA DVI HDMI Video Card - AX4850 512MD3-HV2 In Canada.

I can still cancel it if you think HD 4770 is better in performance. I think it is selling for $135. Thanks for quick advice.
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Old May 28, 2009, 09:47 AM
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4850 SHOULD NOT be 128-bit. DO NOT BUY SUCH A CARD(even though i think the specs are misleading).

Also, XFX 4850 is on sale for like $113...cancel your purchase!!!



EDIT: Seem like the XFX sold out on NCIX. FYI, 4850 prices should drop lower to about $109-$119, becuase right now 4770 is very rare in the market, so the drop is to cover this.
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Old May 28, 2009, 09:53 AM
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Thanks. Powercolor also has a HD4850 that is 256 bit bus for a lot more money, so the one I ordered is definitely 128 bit.

Can you give me a link to the xfx 4850 that is on sale please. Thanks.

OK. saw your edit. Thanks for info.
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Old May 28, 2009, 10:01 AM
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Gigabyte card for $141.68, plus $20 rebate(for $121.68 final price, AR)

NCIX.com - Buy Gigabyte Radeon HD 4850 625MHZ 512MB 1.92GHZ DDR3 PCI-E CrossFireX DU-DVI-I HDCP HDTV Out Video Card - GV-R485ZL-512H In Canada.

Here's teh XFX, but i guess it was limited sale...maybe 20 pcs or something(normal price reflects same as your powercolour):

NCIX.com - Buy XFX Radeon HD 4850 512MB XXX DDR3 PCI-E Dual DVI-I HDCP HDTV Out Video Card - HD485XYDDC In Canada.

All 48xx should be 256-bit...hence the x8xx in part number, AFAIK.
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Old May 28, 2009, 10:06 AM
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Thanks. I'll call NCIX to see if they will substitute the Gigabyte 4850. The Powercolor one is 256 DDR, but the detailed spec says 128 bit memory bus, and that worries me. So, I pay a few dollars more the the Gigabyte to have a peace of mind.
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Old May 28, 2009, 10:27 AM
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Everything on that page of the PowerColor says 256bit...

No idea where you're seeing 128bit memory nor would any HD4850 be.

Only thing that says 128bit is:
Quote:
128-bit floating point precision for all operations
Which is normal to my knowledge.
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Old May 28, 2009, 08:05 PM
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Does that quote not mean that memory bus can only operate at 128 bit/s speed? while "normal" 4850 can operate at 256 bit/s speed? 4770 operate at 128 bit/s but it has GDDR5 which compensates and can compete with the normal 4850.
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Old May 28, 2009, 08:35 PM
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Floating Point precision has nothing to do with memory...it's the shaders that that refers to.

The 4830/4850/4870/4890 all use the same basic gpu(the 4890 is the exception, with some minor changes), and are pin-compatible, and as such, all share the same memory bus functions.

the 128-bit memory gpus are completely different silicon, but the 4890 could be down-binned to any of the other 48xx line, with a simple pcb change.
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Old May 28, 2009, 10:22 PM
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Thanks for your explanation. Since the Powercolor HD 4850 is in back order, I have called NCIX to exchange it for the Gigabyte 4850 which is in stock, for another $7.

I just read the thread about i7 920/940 being discontinued after i5 comes out, which is disturbing news. I'll really have to think hard if I want to built something which will have such a short upgrade life. I still have the option to rma the motherboard and the memory, keep the PSU and the video card and built AMD PII X3 720.
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Old May 28, 2009, 10:30 PM
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Don't worry about the i7 if you already brought it, you won't need a new CPU for at least 2 years, look at the Q6600, it's still good.
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