AMD Radeon HD 4770 Specs Unveiled
AMD has finally unveiled the specs of its Radeon HD 4770 based on RV740 chip. Let’s check it out together.
Designed to take the place of Radeon HD 4830, Radeon HD 4770 also features 640 stream processors. But the memory interface has been slashed from 256bit to 128bit. However, AMD will ship it with high-speed GDDR5 memory, and core/memory clock of 750/800MHz, which makes it equally efficient as 3.2GHz DDR. Radeon HD 4770 will come with 826 million transistors, which means 130 million ones less than 956 million on Radeon HD 4830. Thanks to the 40nm manufacturing process, the power consumption has been reduced to 80W.
AMD Radeon HD 4770 is slated to launch on May 4th, and the price tag would be $99.
March 31st, 2009 at 7:48 pm
I want to see if this 4770 can overclock like hell (1 Ghz on Core
and 4Ghz on mem ) or not.
If it doesnt, the 4830 for $80 is better coz it does 750-800 on Core and 1100 on memory easily.
April 1st, 2009 at 11:39 am
My guess is this is running at the same voltage as all their ’70 products…and they all start and end at the same place:
2900,3870,4870,4670:
voltage: ~1.25v
stock:,: ~750
overclock: ~850
I mean, really. It’s that predictable.
But…Look at the bright side. The ’90′ camp means a bump to 1.3v, and we know that will bring clocks of over 1ghz, if 4890 is any indication. Don’t hold me to it, but I bet 1.3v going forward is incorporated into the ’70′ line going forward starting with rv870, enabling high stock clocks.
So…Two options:
1. Buy one and volt mod it.
2. Wait for the inevitable 4790 that comes out in a couple months (probably to replace 4870 around the time of the 5800 series.)
In reality, it probably will perform similar to 4830 when all is said and overlocked, but even though the power savings is not even proportional to it’s die size advantage vs 4830 (rv770) because 40nm has leakage issues, it still use 30W less power, or in this market, 1/4-1/3 less, which is always a good thing.
Make no mistake, at this core speed/voltage it is a 4830/4850 replacement, with allowing AMD to cram the same performance into a chip almost half the size, and probably save some money.
Also don’t make the mistake to think r740 isn’t a replacement to rv770 as a whole, but in due time. Think of this as the 8800gt. The faster part comes later through ATi’s method of faster clocks rather than enabled blocks…when they ready to phase out it’s bigger brother (g80/rv770). I reckon we see something with a 850-900/3800-4000, with the OC ability of 1ghz, not unlike 4890.
April 7th, 2009 at 5:14 pm
Does anyone have info whether the HD4770 requires PCI-E power connected?
April 15th, 2009 at 11:54 am
yes it will require pcie according to fudzilla
April 15th, 2009 at 1:57 pm
No, it doesnt require PCIE power connector, the one mentioned by fudzilla was 4750 which uses GDDR3 while 4770 uses GDDR5. GDDR5 uses less power than GDDR3.
April 15th, 2009 at 3:43 pm
It may use GDDR5, but it still draws 80 watts, which is more than a PCI-E 1.0 slot can supply. Even the 4770 sample that Guru3D tested required a PCI-E connector, and that was with 100 Mhz less clock speeds. Both the 4750 and 4770 will require a PCI-E connector according to Fudzilla.